Hello I just bought a 2000 mustang gt with a procharger on it. The ac compressor locked up and cause the belt to eat one of these pulleys which I believe to be part of the procharger kit, it's plastic. It also snapped the belt. I guess I'll measure the old belt and try and find a replacement but I need a new pulley but don't know where to find one ASAP! Or what's it's called... Is it a procharger idler pulley?? Also can you use a different pulley like maybe one from the parts store? Here is a picture. It's the pulley that is between the alternator and the procharger. I need to fix this ASAP my only transportation to work. Any help is appreciated thanks so much.

 

It looks like the idler tension pulley and you should be able to get a replacement at the parts store.