Front mounting kit for the 1963-1987 Chevy GMC Fullsize 1500 2500 3500 Pickup It has an upper Bag plate that bolts onto the upper spring pocket and lower cup that is angled to push it away from the frame as the truck goes up and down with a 3" drop spindle this will lay frame on 20in wheels with no frame modifications, it will lay 22in wheels. Any wheel size bigger then this or if you are planning on Zing the frame we offer custom upper and lower control arm kit.