Fitment: Compatible with 1999-2018 Chevy Silverado/GMC Sierra 1500 2500 3500 Extended Cab Electrophoresis Steel. Replacement for 22770480 GM1601111 22770479 GM1600111 Direct Replacement: Designed to replace the broken, or rusted rocker panels Fresh Look: Will be an economical choice to fix your vehicle's cosmetic look fresh again Material: Made of high quality steel, rocker panels come prepped with electrophoresis. Rust protection Installation: Weld-on installation. Hardware is not included. Professional installation is highly recommended Fitment: Compatible with 1999-2018 Chevy Silverado/GMC Sierra 1500 2500 3500 Extended Cab Electrophoresis Steel. Replacement for 22770480 GM0479 GM1600111 Direct Replacement: Designed to replace the broken, or rusted rocker panels Fresh Look: Will be an economical choice to fix your vehicle's cosmetic look fresh again Material: Made of high quality steel, rocker panels come prepped with electrophoresis. Rust protection Installation: Weld-on installation. Hardware is not included. Professional installation is highly recommended