US Fed A/C Compressor Clutch

[lotuselanman]

Does anybody know the parts number (GM prefferably) of the Clutch for the A/C Compressor? I need to get one but I don't want to buy the whole compressor as it's too cost prohibitive. I might need the seals for it as well. Any Idea where I can get this and what other cars it is used in? Thank you!