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Mustang Widebody Kit | 2015-2017 GT S550 | SHIROKAI

$5,490.00
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SHIROKAI - WIDEBODY KITS THAT FIT  |  SKU: S550.1517.WBF
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Not sure it fits? Ask our parts team.

The SHIROKAI 2015–2017 Mustang S550 Widebody Kit is engineered for the pre-facelift Ford Mustang S550 platform, giving GT and EcoBoost builds real width, stronger presence, and more room for an aggressive wheel and tire setup — while still following the factory body lines.

This is not just an overfenders kit. Each SHIROKAI Mustang S550 widebody kit is CNC-cut from platform-specific 3D scan data for cleaner fitment, better proportions, and less fabrication drama during installation. Made from premium automotive ABS plastic, it brings the signature Kaiju stance without turning the car into a random bolt-on mess.

Ford Mustang S550 (2015-2017) Widebody Kit — Quick Facts

  • Fits: 2015–2017 Mustang GT and EcoBoost (plug-and-play), Convertible kit-only (spoiler excluded), Shelby GT350 with minor bumper mods
  • Material: Automotive-grade ABS plastic, 3D-scanned and CNC-cut from OEM body
  • Width added: +3.54 in (9 cm) per side front, +4.33 in (11 cm) per side rear — 180 mm total at the front and 220 mm total at the rear
  • Install: 12–16 hours at a body shop, plug-and-play for 2015–2017 GT/EcoBoost with stock bumper
  • Includes: Front flares, rear flares, side skirts, bumper endings, front lip spoiler; rear ducktail spoiler only with the “Full kit with ducktail spoiler” configuration. Mounting hardware is sold separately
  • Price: See the current price for your selected configuration above.
  • Status: SHIROKAI's most popular Mustang platform, with strong owner community across US, EU, and Asia
  • Shipping: Worldwide delivery. Shipping is calculated for your address in your selected currency at checkout.

What’s in the Ford Mustang S550 Widebody Kit

  • Front fender flares
  • Rear fender flares
  • Side skirts
  • Bumper fender endings
  • Front lip spoiler
  • Rear trunk spoiler — only with the “Full kit with ducktail spoiler” configuration
  • Mounting hardware is sold separately

Width & Specs

Front fenders add 3.54 in (9 cm) per side, rear fenders add 4.33 in (11 cm) per side, measured from the stock arch — room for an aggressive wheel and tire setup.

  • High-grade automotive ABS plastic
  • Black in mass — wrappable straight out of the box (light sanding + primer recommended for best paint result)
  • Vehicle-specific panels; professional test fitting and installation recommended

Ford Mustang S550 Widebody Kit Fitment Guide (2015–2017)

Confirmed fitment for 2015, 2016 and 2017 Ford Mustang:

Year Model Fitment Notes
2015–2017 Mustang GT ✅ Plug & Play Vehicle-specific fit; test fitting and drilling are required
2015–2017 Mustang EcoBoost ✅ Plug & Play Vehicle-specific fit; test fitting and drilling are required
2015–2017 Mustang Convertible ⚠️ Partial fit Kit fits, ducktail spoiler excluded (different trunk lid)
2015–2017 Shelby GT350 & non-GT bumpers 🔧 With modifications Minor front bumper modifications required
2018–2023 Mustang S550 facelift ❌ Different kit See the S550 2018–2023 kit →
2005–2014 Mustang S197 ❌ Different kit See the S197 widebody kit →

Not sure about your trim? Email i@shirok.ai — we confirm fitment within 24h.

Technical Specifications

Spec Detail
Material Automotive-grade ABS plastic
Manufacturing CNC-cut from OEM 3D scan data
Front flare width +3.54 in / +9 cm per side
Rear flare width +4.33 in / +11 cm per side
Total added width 180 mm total at the front; 220 mm total at the rear
Components Kit components: front flares (2), rear flares (2), side skirts (2), bumper endings, front lip spoiler; ducktail spoiler only in the full-kit configuration
Mounting Bolt-on; mounting hardware sold separately, drilling and rivnuts required
Install time 12–16 hours at a body shop
Paint prep Light sanding + primer recommended for best finish
Wrap compatibility Yes, surface ready out of the box
Compatible vehicles 2015–2017 Mustang GT/EcoBoost (plug-and-play), Convertible (kit-only), Shelby GT350 (with mods)
Country of manufacture Turkey (Bursa)
Catalog status Best-selling Mustang widebody kit
Support Lifetime tech support from manufacturer

2015–2017 Mustang S550 Widebody Kit by SHIROKAI

All you need is steady hands, a heat gun, and some cut-and-sand instrumentals. With a growing community of SHIROKAI Mustang owners asking for the next generation, we built this kit for S550 owners — and it became an absolute best seller. If there’s a Mustang with a SHIROKAI kit at a show, it gets attention and love. The wide fender flares let you run larger, aggressive wheels, and every panel follows the Mustang’s bodylines for an accurate, easier install. Build it for street or show — this wide body S550 setup gives your car a powerful, planted stance.

Wheels & Tires

Dial in your exact setup with our Widebody Wheel Fitment Calculator.

Want to test our quality first? The ducktail spoiler is included in the full kit, and also sold separately (works with both pre-facelift and facelift cars). See the S550 Ducktail Spoiler →

Finishing

The finish is ready for your next step and can be wrapped from the box (light sanding + primer recommended for paint). Add your own wheels or combine with other SHIROKAI styling parts for a full transformation.

Frequently Asked Questions

Will this kit work on my Mustang Convertible?

Partially. The flares, side skirts, lip, and bumper endings all fit a 2015–2017 Convertible identically to the Coupe. However, the ducktail spoiler is excluded — Convertibles use a different trunk lid geometry that the spoiler doesn't match. Convertible owners typically order the kit without the ducktail spoiler option at checkout.

What about Shelby GT350 fitment?

The GT350 uses a different front bumper than the standard GT. The kit fits with minor front bumper modifications — typically light trim work to mate the bumper endings cleanly with the flares. A competent body shop handles this in 1–2 extra hours during install. All other panels (flares, skirts, spoiler) fit identically to the GT.

Is this kit different from the 2018–2023 S550 kit?

Yes. The 2018–2023 facelift Mustang has a redesigned front fascia, hood, and headlights — so it uses a separate kit. The 2015–2017 kit you're looking at is engineered specifically for the pre-facelift S550 body. If you have a 2018–2023, see our S550 2018–2023 widebody kit.

How does the width compare to other SHIROKAI Mustang kits?

The S550 kit adds 180 mm of total width at the front and 220 mm at the rear (9 cm front and 11 cm rear per side). Our S197 kits add 180 mm total at the front and 240 mm at the rear (9 cm front and 12 cm rear per side). The slightly narrower S550 stance is intentional — it follows the S550's tighter factory body lines for a cleaner, OEM+ aggressive look rather than maximum-width drama.

How long does installation take?

Typical body shop install runs 12 to 16 hours including test fit, drilling, and rivnut setup. The install requires drilling holes in the fender for rivnut-mounted flares — this is standard procedure for properly secured aftermarket widebody and shouldn't be attempted without the right tools.

Will my doors still open with the flares installed?

Yes. The flares follow the factory door cutline. Both doors remain fully operable at any opening angle. The kit does not interfere with door handles, mirrors, or fuel filler door operation.

What wheel and tire setup works with this kit?

The added width supports significantly wider wheel and tire setups than stock — typically 19x11 or 20x11 wheels with 295–315 mm tires in the rear, and 19x10 with 275–285 mm tires up front depending on offset preference. Use our Widebody Wheel Fitment Calculator for precise sizing tailored to this kit.

Wrong item or delivery damage? Contact our team for help with your order.

What to know before you install
Install recommendation Install Type Pro recommended
Install time Time 1–2 hrs
Test-fit first Before Install Test-fit first
Check finish Finish Check finish
ABS plastic Material ABS plastic
What to expect
Test-fit before final install. Finish and paint requirements can vary by product or selected option, so check the product description before installing.
Material note
ABS is a molded plastic commonly used for trim and exterior parts. Paint/prep depends on finish.
Not sure what this install needs? Email support@k2-industries.com before ordering.
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Fitment: Vehicle fitment is listed in the title and description. Not sure it fits yours? Email us and we’ll confirm it for you.

Shipping, returns & warranty
Check vehicle compatibility

Check the product fitment notes for your year, model and trim

Need help choosing?

Not sure? Email support@k2-industries.com for a real specialist to help you order

Installation questions?

Installation questions? Email our team before or after your purchase

Warranty details

Questions about warranty coverage? Our team can walk you through it. Contact us

Return policy

See the return policy for this item’s details. Questions? We’re happy to help before you order.

Read return policy · Contact us

Shipping & Returns

Shipping Information:

At K2 Industries, we strive to provide a seamless and efficient shopping experience for automotive enthusiasts like you. Our commitment is to deliver high-quality parts to your doorstep with the utmost care.

Fast and Reliable Shipping:
Many of our products are stocked in our local warehouse, ensuring swift processing and delivery. Orders placed for these items typically ship within 2-5 business days, allowing you to get your parts in no time.

Extended Selection, Global Reach:
To offer you a broader range of automotive parts, some items are sourced from trusted suppliers around the world. While these products might have a slightly longer processing time, we assure you that the wait is worth it for the exceptional quality and value they bring.

Shipping Transparency:
For products shipped internationally, we provide estimated delivery times on the product page. Rest assured, we are continually working to optimize our supply chain and minimize any potential delays.

Combined Shipments:
To streamline your shopping experience, if your order includes items from both our local warehouse and international suppliers, they may be shipped separately. You will receive separate tracking information for each shipment.

Questions or Concerns?
If you have any questions about shipping or would like assistance tracking your order, our dedicated customer support team is here to help. Feel free to reach out to us at support@k2-industries.com.

You can also track your order here

Thank you for choosing K2 Industries for your automotive needs. We appreciate your trust in us.

FAQs

Do body kit parts need prep before installation?

Yes. Widebody and body kit parts should be test-fitted, prepped, and installed by a professional body shop. Minor sanding or trimming is normal for custom builds across the aftermarket.

How long does a full body kit install take?

Several days at a body shop. Mounting is one part — prep, paint, and final assembly take the most time.

Will body kit parts fit if my car has had bodywork before?

Aftermarket body parts are designed for OEM panel dimensions. If your car has aftermarket fenders, frame damage, or non-stock panels, fitment may need adjustment. Send us photos before ordering and we'll flag anything to watch for.

Can I order parts of the kit separately?

Yes. Most body kit components are sold individually as well as in full kits. Message us if you want help mixing components from different kits to create your own setup.

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What You Get With Every Order

Products Selected to Meet Quality & Fitment Standards we Stand Behind.
Products Selected to Meet Quality & Fitment Standards we Stand Behind.
Get Help From People Who Actually Understand Builds & Fitment.
Get Help From People Who Actually Understand Builds & Fitment.
Designed to Resist UV Exposure, Wear, and Everyday Use.
Designed to Resist UV Exposure, Wear, and Everyday Use.
Join Thousands of Builders Who Trust K2
Join Thousands of Builders Who Trust K2

What Sets K2 Industries Apart?

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Pre-order fitment help
Delivery issue support
Real Experts Answer the Phone
Post-Purchase Installation Support
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GuaranteeCheck compatibility before ordering

The K2 Difference

  • • Check the product fitment notes and contact our team if you need help confirming compatibility before ordering.
  • • Real specialists answer your questions in minutes, not chatbots reading scripts. We've built the same cars you're building.
  • • Freight damage, wrong parts, installation question, we handle it so you don't deal with suppliers or shipping companies.

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Frequently Asked Questions

How do I know this will actually fit my car?

Every part listing shows compatible years, models, and trims. But here's the thing—trim packages and factory options can be confusing. If you're not 100% certain, text us at 772-277-2495 with your VIN or photos of your car. We'll verify fitment before you order so you're not stuck with an $800 part that doesn't fit. We've done this for 30,000+ builds. We've seen every weird trim combo and factory option. Takes us 2 minutes to verify, saves you weeks of headaches.

What if the part arrives damaged or is the wrong item?

We handle it. You don't fight with freight companies or file claims. Text us photos within 48 hours of delivery. If it's damaged or wrong, we ship a replacement immediately. You're not waiting 6 weeks for a freight claim to process. We eat the cost, not you. This is why we package everything like it's going to war. But if something slips through, we fix it ASAP. No forms, no back-and-forth, no "file a claim and wait." Just text us and we handle it.

Can I install this myself or do I need a shop?

Depends on the part. Emblems, front lips, some spoilers, bolt-on, DIY-friendly, you can do it in your driveway with basic tools. Full bumpers, hoods, wide-body kits, possible for experienced DIYers but most people take them to a shop for paint and install. Check the product description for installation difficulty. If you're unsure, text us. We'll be honest about whether you can handle it or if you should take it to a pro. We'd rather you know upfront than get frustrated halfway through.

What's your return policy if it doesn't fit or I don't like it?

Return policy

See the return policy for this item’s details. Questions? We’re happy to help before you order.

Read return policy · Contact us

Do you offer financing?

Yes. Affirm and Shop Pay available at checkout for orders over $50. Split payments over 3-12 months depending on order size. No hard credit check to see your options. Most people use this for big-ticket items like body kits, suspension setups, or wheel/tire packages. Rates vary based on credit. You see the monthly payment before you commit. Makes it easier to build now instead of waiting months to save up.

What if I have questions after I receive the part?

Text 772-277-2495. We don't disappear after you buy. Fitment questions, installation issues, "does this bolt go here" questions... we'll walk you through it. We've installed these parts ourselves or helped hundreds of people install them. You're not getting transferred to a call center in the Philippines. You're texting someone who's actually installed your part before. If we can't help remotely, we'll recommend a local shop that knows these parts.

Why should I buy from K2 instead of eBay/Amazon/other sites?

eBay and Amazon sellers don't answer fitment questions. They don't verify your VIN before shipping. They don't handle freight damage claims for you. If something goes wrong, you're filing disputes and waiting weeks. We're builders selling to builders. We verify fitment before you order. We handle damage claims same-day. We answer texts in minutes. We're not the cheapest, but you're not gambling $800 on whether a part fits. You're paying for support, verification, and someone who cares if your build goes sideways.

What does your warranty cover?

Warranty details

Questions about warranty coverage? Our team can walk you through it. Contact us

Shipping

Do you ship overseas?

Yes, we ship all over the world. Shipping costs will apply, and will be added at checkout. We run discounts and promotions all year, so stay tuned for exclusive deals.

How much does shipping cost and when will I see the total?

Depending on where you're located, small parts can ship free. Large parts like bumpers, hoods, and body kits require freight shipping. Uou'll see the exact cost at checkout before you pay. Freight usually runs $150-$300 depending on size and your location. We know it's expensive. We negotiate the best rates we can. If you're ordering multiple large parts, text us. We can sometimes combine shipping and save you money. We're not hiding fees in the final step. What you see at checkout is what you pay.

How long will it take to receive my order?

It depends on where you are. Orders processed here will take 5-7 business days to arrive. Overseas deliveries can take anywhere from 7-16 days. Delivery details will be provided in your confirmation email.

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Max, the Owner, started in his garage making E36 M3 tail lights in his own oven.

  • • Started modifying cars before he could legally drive them
  • • Spent years hunting down parts that actually fit and don't suck
  • • Made the same fitment mistakes you're afraid of

You’re not buying from a warehouse. You’re buying from someone who builds cars just like you do.

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