Suggest you get on "Bouchilon's" web sight. I used their bracket #BPE4732 A/C. Had to modify part of it to fit the Magnum style intake I ran along with the LA front cover - and my bracket was for a P/S equipped car, which you don't have. Also had to use their crank and water pump pulleys for a 2 belt system. Compressor ( Sanden) was from "Old air products" - 7H13. Their part # 21-7312. My Duster had factory air, so I just updated the compressor and hi /low side lines and used all the other original stuff ( condenser, evaporator, expansion valve ). Cools great! Again, go to Bouchilon's site first.
