Driver side window replacement???

My sons car was broken into last week. Damn punks got nothing, I heard it and was out there in 2 minutes. They made a mess when they broke the driver side front window. I picked up a pick of glass from the gunk yard, we took the door off only to realize they gave me the rear window instead of the front.. We looked at the door and window motor but we could never see anything move inside the door.. I see no arms moving around inside.. There are only a few small opening to see into. If I remove the speaker would the arms behind it? Can someone give me some guidance here. What should I be looking for here?

what year?

1990 4 door, Front drivers side glass broke..........