Need help restoring a W900A

Hello I’m new to posting on here but I have learned a lot while researching different topics.
I recently bought an 81 W900A and im having a hard time finding parts. The dealers are hit and miss with info. It usually takes me days of searching everywhere I can before I finally find the right part. Now I’m completely stuck trying to find the correct window regulator for it. I ordered the chain style one that shows up on every parts lookup I have access to. The shop contacted me and said it isn’t the correct one. They sent me a picture of it and I can’t match it up to anything. It looks like the style of the new W900 part but is shorter. If anyone has any info please share. Thanks

 

It’s similar but it’s bigger than the one on the picture. I’m going to the shop tomorrow to see if there’s a part number stamped on it anywhere. Or if I can get the chain style regulator to work. Both left and right doors have that odd regulator.

 

I haven’t seen it myself yet. It didn’t work when I dropped it off. Looks like it’s missing some dowels on the picture.

 

Down my way, they have crushed most of the trucks, pickups and cars we needed for projects. I’m in the southeast Louisiana area near Mississippi. I suspect the part isn’t original ro the truck. Heading to the shop now to see if I can figure it out.