Wondering if I can go to the yard and find this piece. The March kit does not include it, it's $110 otherwise. I can get an entire new compressor (Sanden 508) on ebay for $129. Is this just a standard serpentine pulley that any sanden compressor uses? or is it specific for a 508 model.

http://marchperformancedealers.com/products/ac_clutch.jpg