Getting ready to buy a pump from someone on this forum. What pump pulley do I need to get for a AC car, GT500? I know a 7AB is correct for non AC car, but Is a 7AB wrong for an AC car? My AC is vintage air not original, my car started as a non AC car but I live in Arizona so having a car without AC is not possible. Right now I have a 7AD on the current pump which is not the pump with the correct return nipple.