The RustBuster over-axle frame repair kit for 1999–2006 Chevy Silverado and GMC Sierra is a left-side repair panel intended to replace corroded frame material behind the rear axle. Specified for those model years, it restores the rail area to preserve suspension alignment and bed mounting points as part of a structural frame repair.
Rust Buster 1999-2006 Chevy Silverado/GMC Sierra Over-Axle Frame Repair Kit - Left