Duramax & Heavy-Duty Models

1999–2006 Chevy Silverado & GMC Sierra 3rd Door – Extended Cab Replacement Door

Replacement third doors are available for 1999–2006 Chevrolet Silverado and GMC Sierra trucks, including applications for Duramax-powered models and heavy-duty GM pickups. This particular door is designed for GM trucks equipped with the three-door extended-cab configuration, making it a useful replacement for a damaged, rusted, or worn original third door.

Third-door panels can be difficult to locate in good condition, especially for older GMT800-era trucks. This replacement is a practical option for customers restoring an older Silverado or Sierra, repairing an extended-cab work truck, or sourcing original-style body panels for a project vehicle.

Product Details

• Fits: 1999–2006 Chevrolet Silverado
• Fits: 1999–2006 GMC Sierra
• Application: GM extended-cab trucks with the 3-door configuration
• Compatible applications: Silverado, Sierra, and select Duramax/HD configurations
• Part: Third door / rear access door
• Type: Replacement GM truck body panel
• Additional rear doors: Limited availability
• Short beds: Available
• Location: Wichita, KS
• Nationwide shipping available

Hard-to-Find GMT800 Third Door Replacement

If the original third door on your 1999, 2000, 2001, 2002, 2003, 2004, 2005, or 2006 Silverado or Sierra has suffered from collision damage, corrosion, dents, or years of use, finding the correct replacement can be challenging. This listing specifically targets the three-door extended-cab GM configuration, rather than the standard four-door crew-cab setup.

These doors can be useful for GMT800 restorations, Duramax truck repairs, Silverado 2500HD and 3500HD projects, Sierra HD builds, work-truck repairs, and body-panel replacement.

We also have a limited selection of rear doors and 1999–2006 GM short beds available. Inventory changes frequently, so ask about current parts if you’re repairing multiple areas of the same truck.