MaxTrac 01-10 GM 1500HD/2500HD/3500HD 2WD/4WD 8 Lug 2.5in/1in Torsion Key Lift KitMaxtrac Suspensions torsion keys offer a quick and easy solution to changing the height on the front of your vehicle, for the desired stance. The installation of these keys provide additional clearance for the front of your vehicle, allowing a larger tire size. This kit also comes with the shock extenders, 1" cast lift blocks & Ubolts. This Part Fits: Year Make Model Submodel 2005 Chevrolet Silverado 1500 HD Base 2001 2003,2005 Chevrolet Silverado