Bilstein 5100 Monotube Gas Shock Set 2011-2018 Chevrolet Silverado 2500 HD 4WD Set of 4 Shocks - Fits 4WD Vehicles for Front Lifted Height: 0-1.5" and Rear Lifted Height: 0-1" Shock boots included with all shocks except in cases of special fitment. Monotube gas charged for longevity, durability, and performance. All necessary washers, bushings, and nuts included. Factory shock mounting bolts are reused for installation. Bilstein's Limited Lifetime manufacturer's Warranty protects against defects and premature failure.