Fox 07-18 GM 1500 2.5 Performance IFP Front Coilover - 2-3in Lift*IMPORTANT*: Cast aluminum lower control arm required for '16 18 model year trucks for CV boot clearance. OE aluminum lower control arm reference numbers = 22853473 and 22853474, or equivalents. Cast aluminum and stamped steel lower control arms have the same ball joint taper. Cast steel LCAs have a different ball joint taper and would not be usable for 16 '18 model years. Installation Instructions This Part Fits: Year Make Model Submodel 2016 2018