I have bought a new AC belt for a 79 bonniville and I can't get the new belt on. I have removed the other two belts in front of where the ac belt goes, but I can't get the new belt to go on the pully. Is there a way to move the pully and put on the belt because I can't find a way to do it. I know how to do it on my buick, but I don't see a way to move pully on the pontiac.