72 Dart RV2 to Sanden Compressor

I am finishing up my 72 Dart Swinger. It has factory A/C and that big ole honkin' RV2 compressor. The AC is still R12 and has a leak somewhere. If you charge it, it will stay cold for a couple days then that is it. It is 318, 2-bbl, auto. I would very much like to take off the big RV2 and replace with a smaller Sanden while I am getting the A/C to work.

Question: Who makes the necessary brackets to do this and what model compressor should I use?

Thanks in advance for the help.