I was looking at a Sanden 510.
Sanden 510
The seller says that these have all new internals, just in a used case. So they are remanufactured from old cores. It comes with the clutch, and they have them for dual V-belts, so I should be able to get it to line up with my existing idler pulley.
I also found this York to Sanden bracket, which should be able to bolt up to my existing mounting bracket for the York. If not, I can cut and weld!
Bracket
I also saw this bracket pop up on ebay from the same guy selling the remanufactured 510 compressors. It is different from the first bracket, which looks a bit more substantial. Any comments on either?
Bracket 2