Are you determined to stick with the piston style York or do you just want to have A/C? I have an almost new York I'd sell, but in the long run you'd be better off with a later compressor. The ones used in the e28 are widely available and inexpensive. I bought a refurbished one for $75. They're r134a compatible, don't need the muffler (that other can on your fender by the dryer), and use less HP to spin.