Copied from the Global West website:
Donor cars with tall spindles and 11 inch disc brake rotors:
Buick full size 77-81, Century 73-77, Riviera 77-78, Skylark 75-79, Cadillac Seville 76, Chevy full size 77-81, Camaro 70-81, Chevelle 73-77, Monte Carlo,Nova 75-79, GMC Sprint 73-77, Pontiac full size 77-81, Firebird 70-81, Grand Prix 73-77, Lemans 73-77, Phoenix 77-79, Ventura 75-77, Oldsmobile Cutlass 73-77, Omega 75-79
Donor cars with tall spindles and 12 inch disc brake rotors:
Buick full size: LeSabre wagon/Electra wagon 77-94
Cadillac Fleetwood/Deville 77-84 Brougham/Fleetwood 85-94
Chevy full size: Bel Air/Biscayne/Caprice/Impala 77-96
Olds: 98/Delta88/Delta 88 wagon 77-92
Pontiac full size: Bonneville/Catalina/Grandville 77-86
Important: There are two different types of 12 inch disc brakes spindles. One version uses a small outer bearing measuring .750. The second type uses a larger outer bearing measuring .850. Use the larger diameter outer bearing spindle because the rotor you are going to need is off a 1988-92 1LE Camaro/Firebird GM part #18016035. These rotors have the correct bolt pattern 5 on 4 3/4 bolt circle, however the rotors use 12mm studs rather than 7/16 studs. You need to change the studs over to 7/16. We use a DBS-42 kit for this conversion.