2013-2020 BRZ, FR-S & 86 Quarter Panel: A Guide to This Structural, Weld-On Repair
This guide covers the complex, weld-on replacement process, part number compatibility, and what to inspect when buying a used quarter panel for your Subaru BRZ, Scion FR-S, or Toyota 86.
- This is a structural, weld-on panel requiring professional installation by a body shop; it is not a DIY project.
- Quarter panels are fully interchangeable between all 2013-2020 Subaru BRZ, Scion FR-S, and Toyota 86 models.
- The quarter glass molding is a one-time-use part and must be replaced anytime the glass is removed.
- When buying a used panel, it is critical to verify it was 'cut long' with plenty of pillar material attached and has no hidden prior repairs or rust.
Understanding the BRZ/86/FR-S Quarter Panel
The rear quarter panel on the 2018-2020 Subaru BRZ and its siblings, the Toyota 86 and Scion FR-S, is a major structural part of the car. It is not a simple bolt-off, bolt-on piece. Replacement requires a body shop to drill out dozens of factory spot welds, make precise cuts in structural pillars, and weld the new panel into place. This is a complex and labor-intensive job that is crucial for restoring the vehicle's structural integrity, panel gaps, and appearance after a collision.
Warning: This is a weld-on structural panel. Replacement should only be performed by a professional body shop with experience in unibody repair. Improper installation can compromise the vehicle's safety and structural integrity.
Symptoms of a Failing Quarter Panel
Failure of a quarter panel is almost always due to external factors, not mechanical breakdown. Here’s what to look for:
- Collision Damage: The most common reason for replacement is damage from an accident. This can range from deep scratches and large dents to the panel being completely crushed or torn.
- Rust Perforation: In areas with heavy road salt use, rust can form, especially along the wheel arch lip and lower seams. Once the metal is perforated (rusted through), a patch or full panel replacement is the only proper repair.
- Severe Dents: While minor dents can often be fixed with paintless dent repair (PDR), large or sharply creased dents may stretch the metal, making replacement a more effective and sometimes cheaper option than extensive bodywork.
Buying a Used Quarter Panel Assy: What to Check
For a part like this, a used OEM panel is often a better choice than a new aftermarket one due to superior fit, finish, and material quality. Here is a detailed checklist for inspecting a used quarter panel:
- Inspect for Hidden Repairs: Look at the backside of the panel. Check for any signs of Bondo (body filler), mismatched primer, or hammer marks. Run your hand along the surface to feel for any waviness that might indicate a previous repair.
- Check for Rust: Thoroughly inspect the inner and outer wheel arch lip, the bottom edge where it meets the rocker panel, and any seams. Surface rust can be treated, but avoid any panel with bubbling paint or flaking metal, which indicates deeper corrosion.
- Verify the Cuts: This is the most critical step. A salvage yard removes the panel by cutting the car's pillars. For the panel to be usable, it must be "cut long." This means the salvage yard left plenty of extra material on the pillars (like the roof C-pillar and the rocker panel) attached to the quarter panel. A panel that is cut too short, right at the seam, is nearly worthless because a body shop has nothing to weld to. Communicate with the seller and get clear photos of the cut points before purchasing.
- Confirm Compatibility: The main quarter panel stamping is the same for all 2013-2020 Subaru BRZ, Scion FR-S, and Toyota 86 models. A forum post confirms that all body panels are interchangeable across the first generation, even with the 2017 facelift. You only need to specify the driver (left) or passenger (right) side.
Pro Tip: When sourcing a used panel, ask the salvage yard to leave the quarter glass in place if possible. While the molding is a one-time-use part, having the original glass can sometimes be beneficial, though most body shops will prefer to install a new piece of glass with new seals.
Known Issues, TSBs, and Recalls
There are no known recalls or technical service bulletins (TSBs) from Subaru or the NHTSA specifically for the quarter panel structure of the 2018-2020 BRZ. Searches for recalls on this model year primarily relate to issues like a low-pressure fuel pump failure (NHTSA 21V587) or a rearview camera software issue (NHTSA 18V-935), neither of which involve the body panels. The absence of bulletins suggests no widespread factory defects like premature rust or paint failure on this specific component.
Replacement Overview and Cost
Replacing a weld-on quarter panel is one of the most intensive body repairs. The process involves:
- Removing the rear bumper, tail light, interior trim panels, rear seats, and the rear quarter glass.
- Carefully drilling out all factory spot welds holding the damaged panel.
- Cutting the panel away at specific, approved locations on the pillars.
- Test-fitting the new panel, making adjustments, and welding it into place.
- Applying seam sealer and corrosion protection to all welds and seams.
- Performing body work to smooth the welded areas, followed by priming and painting.
- Reinstalling all trim, glass (with new molding), and components.
Important: The quarter glass molding cannot be reused. It is destroyed during removal and a new one must be purchased for proper sealing and fitment. This is a required ancillary part for the job.
Cost Breakdown
The cost can vary significantly based on labor rates and the extent of the damage. The part itself is only one component of the total price.
| Item | Estimated Cost | Notes |
|---|---|---|
| New OEM Panel | $670 - $997 | Price for one side. Part number 51439CA0009P (Right) has an MSRP of $996.88 but sells for around $670-$790. |
| New Aftermarket Panel | $300 - $650+ | Full weld-on panels are less common in the aftermarket; many are patch panels or carbon fiber overlays. Fitment can be a concern. |
| Used OEM Panel | $350 - $700 | Dependent on condition and whether it is cut properly from the donor vehicle. |
| Shop Labor & Materials | $2,000 - $4,000+ | This is a rough estimate. Labor can be 15-40 hours for removal, installation, and paint. Total repair costs can range from $3,000 to over $6,000. |
Technical Specifications & Part Numbers
These part numbers cover the entire first generation (2013-2020) of the BRZ, FR-S, and 86. Always confirm fitment with the seller using your VIN.
| Position | Subaru Part Number | Toyota/Scion Part Number | Approx. New OEM Price |
|---|---|---|---|
| Right / Passenger Side | 51439CA0009P | SU003-01248 | $670 - $800 |
| Left / Driver Side | 51439CA0109P | SU003-01249 / SU003-07659* | $670 - $800 |
*Note: SU003-07659 is often listed as an inner panel assembly but is associated with the left quarter panel. Part numbers can supersede, so verification is key.
Frequently Asked Questions (FAQ)
Is the quarter panel a bolt-on part like a front fender?
No. The front fender is a bolt-on part and is relatively easy to replace. The rear quarter panel is an integral, welded part of the car's structure and requires professional cutting and welding to replace.
🎬 Watch this full right rear quarter panel replacement processCan I reuse my quarter glass or its molding?
The glass itself can sometimes be reused if removed carefully by a professional. However, the rubber or foam molding around the glass is designed for one-time installation and will be destroyed during removal. You must purchase a new molding for a leak-free installation.
Does the 2017+ facelift model use a different quarter panel?
No. While the front and rear bumpers, headlights, and tail lights were updated in 2017, the core unibody and the quarter panel stampings remained the same. A quarter panel from a 2013 Scion FR-S will fit a 2020 Subaru BRZ.
Why is a used OEM panel often better than a new aftermarket one?
Used OEM (Original Equipment Manufacturer) panels are made by the car's manufacturer, guaranteeing a perfect fit, correct material thickness, and proper contours. Aftermarket panels can sometimes have issues with fitment, requiring extra labor to align, and may use a different grade of steel, potentially affecting safety and longevity.
Helpful Videos
Technical Specifications
OEM Part Numbers: 51439CA0009P 51439CA0109P SU003-01248 SU003-01249 SU003-07659
Material: Stamped Steel. Installation: Weld-on.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Subaru BRZ:
- 🎬 Helpful Videos
- Understanding the BRZ/86/FR-S Quarter Panel
- Symptoms of a Failing Quarter Panel
- Buying a Used Quarter Panel Assy: What to Check
- Known Issues, TSBs, and Recalls
- Replacement Overview and Cost
- Cost Breakdown
- Technical Specifications & Part Numbers
- Frequently Asked Questions (FAQ)
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