Bilstein 5100 Monotube Shocks Set for 99-06 CHEVY Silverado 1500 4WD w/0-2.5" Lift Part Numbers 24-186643 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; Excludes HD Models. Fits models with Torsion Key Lift only 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.