Rancho Quicklift Leveling Struts Pair - 07-15 Chevrolet Silverado 2WD & 4WD Part Number RS999901 Front Pair of Struts & Springs for vehicles at factory height or w/0-2" front Lift; These parts fit models with front struts only and will not fit "Classic" Silverado/Sierra 1500 models. Excludes HD Models Fits 2WD & 4WD vehicles Front height not adjustable from specified height. 9 settings of compression and dampening adjustment. Rancho's limited lifetime warranty protects against defects and premature failure. Rancho's 90 day ride guarantee covers RS5000X, RS7000MT, and RS9000XL shocks.