Water Pump Issue

You don't happen to have pictures of this setup? There were two different water pumps used on Ford Mustang engines with serpentine belts depending on how the accessories were setup. I can't find the exact dimensions on them, so it would help to have pictures of the setup. It was very common for some of these older Mustangs to be converted to later model accessories because they were better quality and readily available. It's hard for one person who hasn't owned the car for it's entire life to give you an accurate history as to what's been done with it. With a picture, I might be able to give you a more accurate application for your setup.

Kurt