Application Summary: 2003-2006 Chevrolet Silverado 1500 Base LS LT Z71 WT SS Hybrid (Bed Length: 78.0 & Bed Type: Fleetside & Doors: 4 & Body: Extended Cab Pickup & Cylinder: 6, 8); 2003-2004 Chevrolet Silverado 2500 Base LS LT (Bed Length: 78.0 & Bed Type: Fleetside & Doors: 4 & Body: Extended Cab Pickup & Cylinder: 8 | Qualifier: Short Bed); 2003-2006 Chevrolet Silverado 2500 HD LS LT (Bed Length: 78.0 & Bed Type: Fleetside & Doors: 4 & Body: Extended Cab Pickup & Cylinder: 8 | Qualifier: Short Bed); 2003-2006 GMC Sierra 1500 SLT WT SLE (Bed Length: 78.0 & Bed Type: Fleetside & Doors: 4 & Body: Extended Cab Pickup & Cylinder: 8, 6 | Qualifier: Short Bed); 2003-2004 GMC Sierra 2500 Base SLT SLE (Bed Length: 78.0 & Bed Type: Fleetside & Doors: 4 & Body: Extended Cab Pickup & Cylinder: 8 | Qualifier: Short Bed); 2003-2006 GMC Sierra 2500 HD Base SL SLT SLE (Bed Length: 78.0 & Bed Type: Fleetside & Doors: 4 & Body: Extended Cab Pickup & Cylinder: 8 | Qualifier: Short Bed)