a/c brackets

Is there anybody that has put a newer style a/c compressor (the short, I think r4) on the pontiac motors? if so do you know where I can get the brackets to mount it up?

Hello,
I don't know of anybody making aftermarket AC brackets for late AC compressers......
I do know that aftermarket AC kits are out and about, I think you should start looking for aftermarket AC kits.

I hope this helps, if you find an answer I would like to know it.
Got a Pic of your 72?