AMP Research 1999-2006 Chevy/GMC Silverado/Sierra Extended/Crew PowerStep - Black1999 2005 Chevrolet Silverado 1500 Base Extended Cab Pickup; 2004 2006 Chevrolet Silverado 1500 Hybrid Extended Cab Pickup; 2004 2006 Chevrolet Silverado 1500 LS Crew Cab Pickup; 1999 2006 Chevrolet Silverado 1500 LS Extended Cab Pickup; 2004 2006 Chevrolet Silverado 1500 LT Crew Cab Pickup; 1999 2006 Chevrolet Silverado 1500 LT Extended Cab Pickup; 2003 2006 Chevrolet Silverado 1500 SS Extended Cab Pickup; 2003 2004 Chevrolet Silverado 1500 WT