If you've replaced a door glass, you know there is a roller assembly at the front and rear of the glass. The roller must be bolted on the INSIDE of the glass. You can actually bolt it on either side of the glass and that is what someone had done with the front roller when replacing the glass at some time or another.
I received great help and advise from Fbody69 Jim, He sent me a detailed door part break down. I may not have figured this out otherwise. Thanks very much, Jim