PRO-TRUCK Coilover (Front) GMC Sierra 1500 2WD & 4WD Models (2014-2018) Pre-Assembled Factory Direct Replacement Front Coilover - No Additional Parts Required. Sold in Pairs. Adjustable Threaded Spring Perch to Accommodate Increased Loads and Maximum Clearance. ERO Off-Road Race Spring Equipped and Compatible. Anodized 6061-T6 Billet Aluminum Mounts 46mm Piston Monotube Design with Nitrogen Filled Variable Force Valving. Individually Dyno Tested...