Sbc with procharger. Which r4 compressor to buy?

[anarchy99]

Hey guys, I recently bit the bullit and ordered the ac relocation bracket for the procharger setup in my 69 camaro. I've ordered stuff from procharger before, and shipping was always perfect and instructions included, but this time, only the bracket and hardware showed up and nothing else. My question I guess is what r4 compressor should I be ordering,( from which make and model car), and also, I was slowly piecing together the stuff for a vintage air type setup. Can anone that's done this type of setup with a procharger setup give me any good pointers on stuff they would have done different or things that helped them out with this type of install. Thanks in advance.