I have a loud whine not belt squeak from what i think is the idler pulley. i changes pitch/speed with engine rpm. engine is a 2.2 eco with m62 supercharger. i called auto zone and they dont show my car as having an idler pulley but its there for sure. now its not a tensioner its just a fixed pulley directly under my engine mount. can some one direct me to the replacement part number from either oreileys or auto zone.