ECOTRIC Inner & Outer Rocker Panels + Cab Corners Compatible with 1999-2007 Chevy Silverado GMC Sierra 4 Door Extended Cab Replacement for 0856-001 0856-002 0856-115 0856-116 Fitment (Outer Rocker Panels & Cab Corners): Compatible with 1999-2007 Chevy Silverado 4 door extended cab, 1999-2007 GMC Sierra 4 door extended cab. Fitment (Inner Rocker Panels): Compatible with 2000-2006 Chevy Silverado 4 door extended cab, 2000-2006 GMC Sierra 4 door extended cab. Direct Replacement: Outer Rocker Panels reference part number: 0856-001, 0856-002. Cab Corners reference part number: 0856-115, 0856-116. Feature: Made of high quality steel for strength and durability. Directly replaces the parts become scratched or broken on your car, restore a new appearance for you. Package & Installation: 1 pair of Inner Rocker Panels, 1x pair of Outer Rocker Panels and 1x pair of Cab Corners. Please note that you will receive 3 packages. No hardware & instructions included. Weld-on installation. Professional installation is highly recommended.