For Chevrolet C10 / for GMC C15 Truck 1963-1972. Pair 5" Rear Lowering Springs for Chevy C10 GMC C15 1960-1972 Rustproofing. Rear 4" Drop Lowered Coil Springs For Chevy C10 GMC C15 2WD 1960-1972. Front 3" Rear 5" Drop Lowering Kit for Chevrolet C10 GMC C15 C1500 1963-1972.