FOX PERFORMANCE IFP SHOCKS FRONT+REAR 2001-2010 SILVERADO SIERRA 2500 3500 0-1" Part Numbers 980-24-663 and 980-24-664 Set of 4 Shocks for vehicles at factory height or w/0-1" front Lift and w/0-1" rear Lift Fits 2WD & 4WD vehicles Shock boots & Roost Shields sold separately. All necessary washers, bushings, reservoir clamps, and nuts included. Factory shock mounting bolts are reused for installation. Mounting plates sold separately. Fox's limited one (1) year warranty protects against defects and premature failure.