Fitment：Compatible with Chevy Silverado 1500 (2WD/ 4WD/ AWD) 2007-2018. Compatible with Chevy Silverado 1500 (2WD/ 4WD/ AWD) 2019 (Fit CLASSIC Body Style ONLY). Compatible with GMC Sierra 1500 (2WD/ 4WD/ AWD) 2007-2018. Compatible with GMC Sierra 1500 (2WD/ 4WD/ AWD) 2019 (Fit CLASSIC Body Style ONLY). NOT fit 2007 models with the Classic Body Style. Fits New Body Style ONLY. Excellent Material: The Rear Lowering Shock Extenders are made of high-quality iron material, with a very sturdy internal structure that is not easily damaged, and high strength and durability Safety: Rear Lowering Shock Extenders effectively reduce vehicle body roll during turns, enhance stability and handling, and ensure vehicle safety Reducing vibration: These reduced shock absorbers are an excellent supplement to any lowered vehicle. When you lower the rear of the vehicle, these extension components can maintain inventory of rear vibrations. Easy to install: Size compliant, can perfectly fit the vehicle, and can be directly installed without modification through bolted connections Rear Lowering Shock Extenders Compatible with Chevy Silverado GMC Sierra 1500 (2WD/ 4WD/ AWD) 2007-2018/Fit Silverado Sierra 1500 2019 (Fit CLASSIC Body Style ONLY)