nstallation of our bracket kits allows for the stock Mustang II rotors and calipers to be updated to larger 11" diameter rotors and GM calipers. Our kit will bolt-on to any 1974-78 Mustang II spindles. GM kits use 1973-76 GM rotors and 1978-88 Malibu calipers. Kit includes caliper brackets, caliper bolts, caliper spacers, bearing spacers, bearing races, grease seals and spindle nuts.