Bilstein 5100 Gas Shock Set 01-10 Chevrolet Silverado 2500HD 4WD w/6" Lift Part Numbers 24-186636 and 24-187183 Set of 4 Shocks for vehicles w/6" front Lift and w/6" rear Lift Fits 4WD vehicles 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.