UMI’s new mounting hardware includes zinc plated high grade bolts, washers and Ny-lock nuts for mounting your new or factory front upper and lower a-arms. Note: 1970-1974 Camaro and Firebird use ½” standard lower a-arm hardware while 1975-1981 use 14mm metric lower a-arm hardware. UMI suggests checking your vehicles current hardware size before ordering to confirm. Upper a-arm hardware is the same size for 1970-1981.