Sure looks a lot like a Sanden compressor. I'm sure if you got in contact with them with a bunch of measurements from your old compressor that they could come up with one that will fit. Otherwise, you could try and find a clutch that will fit, which might be more difficult then finding the whole compressor. A bearing for the pulley would be easy.

http://www.sanden.com/index.php?tag=U5H0AMX7Q