Kit includes rotors, hubs, 4-piston calipers, 7075 mounting brackets, wheel studs, and all necessary mounting hardware for proper installation. Fits 1979 Mustang 4&6 Cyl, 1980 all Mustangs, and some 1981 Mustangs. ** Note ** Spindle modifications are required. Installation - Service instructions can be found on Service Bulletin #0086 and #0070.