I have a brand new pulley I was going to put on my GTP, but lost interest in the project. Of course it will work on your '05-'07 SC/SS Cobalts and '04-'07 ION RedLines. The pulley was never installed and it's just taking up space now. I'm looking to get $40 plus shipping out of it.

 

Just for the record.... if it's a ZZP pulley, it will work on a Cobalt ZZP hub. Same bolt pattern.
(Some people don't know that)