k so i found out today that my AC compreesor was causing the supercharger noise in my engine bay. well it turns out that i need a new bearing. when i went to napa today the guy said that theirs two that came up on his computer. does anyone know what bearing to use on a stock compressor?

 

They are probably the same bearing just different design. Meaning one is an open bearing or has a sleeve to protect the bearing made out of metal, the other has a rubber sleeve. Did you get the part numbers by chance? SFK, National Bearing, and CR bearing all have spec books that spell out the differences.