Get a motor and window regulator out of any 81-85 126 car. There were some changes in materials and number of teeth but the unit will transfer if you get the whole thing as a unit. The units are location specific meaning you need a part from the same door as the one not working on your car. This site has info on number of teeth etc if you look up the parts.

Clean and lube the tracks while you have it out. Also lube the latch while you're at it.

__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.