[OldRestorer]

This is what I was told:

The one wire would be the positive; the negative is the metal can itself which is often bonded to chassis ground via the mounting tab soldered to the chassis. (Occasionally it's insulated from chassis and has a separate negative lead.) Mount the negative to the outside aluminum shell!!! The capacitor negative may be floating from the chassis, depending on if there are insulating washers on the mounting nut or not. The center rod through the rubber insulator at the base is the positive connection. It is usually aluminum, so you will have to replace it with a brass screw or similar.

Thanks for the info but I will figure it out somehow, don't want to frustrate anyone.