What Is a Quarter Panel?

The quarter panel is the sheet-metal body section that spans from the rear door opening to the trunk or tailgate, wrapping around the rear wheel well on each side of the vehicle. Unlike a fender, which is typically bolted on, quarter panels are welded structural components — making them one of the most involved body parts to replace. They define the rear haunch of a car's silhouette and play a critical role in both structural rigidity and weatherproofing. Whether you're correcting collision damage on a daily driver or breathing new life into a classic muscle car, sourcing the right quarter panel is a pivotal step in any body restoration project.

Why Quarter Panels Fail

Quarter panels are among the most rust-prone sections of any vehicle. Because the rear tires constantly throw road debris, water, and corrosive road salt up into the wheel wells, the inner and outer sheet metal is under relentless attack. Classics and muscle cars from the 1950s through the 1970s are especially vulnerable — rust prevention techniques at the factory were relatively primitive, and inadequate drainage allowed moisture to pool inside the panels for years at a time. On modern vehicles, collision damage is the more common culprit, with even a moderate rear-quarter impact often requiring full panel replacement to restore structural integrity and a factory finish.

Choosing the Right Quarter Panel Type

Not every repair calls for a full panel replacement. Understanding the product types available helps you match the repair scope to your budget and skill level:

• Full Quarter Panels — Full replacement panels cover the entire quarter section from the door edge to the trunk, including the sail panel and roof line. These are the gold standard for major collision repairs and frame-off restorations.
• Quarter Panel Extensions — Extensions attach at the rearmost edge of the quarter panel, bridging the gap between the panel and the bumper or tail panel. They're a common casualty in minor rear impacts and are often replaced independently.
• Quarter Panel Patches — Patch panels target isolated rust or damage in a specific area, such as the lower quarter or wheel arch. They require less cutting and welding than a full replacement and are ideal for spot repairs where the surrounding metal is still sound.
• Interior Quarter Panel Trim Panels — The interior side of the quarter panel is finished with a molded trim piece that conceals the structural metalwork inside the cabin. These panels are frequently cracked or faded and are straightforward to swap out.
• Quarter Panel Molding — Decorative or protective molding strips that run along the exterior quarter panel surface, adding a factory-correct appearance and guarding against minor door dings and abrasions.

Top Quarter Panel Brands

Sherman is the dominant name in replacement quarter panels. Founded in 1981, Sherman has built a reputation as a recognized leader in OEM-quality replacement parts for collision repair and restoration, with a catalog covering vehicles dating back to 1949. Their panels are engineered by experienced automotive stampers, many of whom also supply OEM parts, ensuring consistent fit and finish.

Goodmark is a go-to source for classic car enthusiasts, particularly those restoring American muscle. Their wide selection of OEM replacement steel panels is offered in multiple coverage styles — including full stock-style panels and 80-percent coverage options — giving restorers flexibility to match the scope of their repair.

Spectra Premium brings its manufacturing expertise to the classic car body panel segment, producing quarter panels crafted from rust-resistant steel and engineered for a seamless fit and finish on vintage vehicles.

Crown Automotive is a trusted supplier of Jeep and Chrysler replacement parts, offering quarter panel components that meet the specific needs of Mopar and off-road vehicle owners.

Scott Drake specializes in Ford Mustang and classic Ford restoration hardware, and their quarter panel offerings are engineered to period-correct factory specifications — making them a natural choice for Mustang restorers seeking authenticity.