Fitment:2000 - 2006 GMC SIERRA 1500HD2000 - 2010 GMC SIERRA 2500HD2000 - 2010 GMC SIERRA 3500HD1999 - 2010 GMC SIERRA 25002001 - 2010 GMC SIERRA 3500* Please note that these Wheel Spacers will CHANGE your vehicle's bolt pattern and are intended for use with 8 x 170 Wheels.**Does not fit Dually ModelsOur Pro-Billet Series Wheel Spacer Adapters are precision engineered to widen your tire track on each side and change your vehicle's 8x6.5" bolt pattern to 8x170mm, improving the look of your vehicle and accommodating wider custom rims and tires. Supreme Suspensions products are developed and rigorously tested by in-house ASE certified specialists, in conjunction with dealerships and professional racers across the United States. Our Pro-Billet Series Wheel Spacers are CNC machined from solid blocks of T6 Aircraft Billet and receive a special anodized coating. Renowned for its sheer strength and light weight, this premium material is guaranteed to withstand even the most extreme environments. Each spacer features splined studs that are pressed into place rather than glued as in many of the lesser, knock-off wheel spacers on the market. Once our spacers are properly installed, they stay installed without the risk of vibrations or imbalance. Please verify fitment compatibility prior to ordering.