Bilstein 5100 Monotube Gas Shock Set 1999-2010 Chevrolet Silverado 2500HD 4WD Part Numbers 24-186735 and 24-186742 Set of 4 Shocks for vehicles at factory height or w/0-2.5" front Lift and w/0-2.5" 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.