McGaughys Deluxe 4/6" Lowering Suspension Kit 17" + Wheels 1/2 Ton Truck 2WD 93021 Chevy Silverado GMC Sierra 2001 - 2006 2WD X/Quad Cab Must use 17" or larger wheels in order to use these spindles. Factory 17" wheels will work with a slight modification, aftermarket cast 17" wheels likely will NOT work. If your truck has a two piece drive line, you may need a carrier bearing relocator. These coil springs were engineered for a truck with a V-8 Engine. If coils are installed on a 6 Cylinder truck then the full drop will not be achieved and the rear will sit lower than the front. Includes: Spindles, Coil Springs, Flip Kit, Flip Plates, Flip Pads, C-Notch Plates, Bump Stops and Bolt Kits