[Elp]

Have you removed the power window motor and tried reconditioning it? Mine were slow & sticking until I took them apart, cleaned & re-lubed them. Clean & lubricate the window lift linkage and channels too.
The drivers one may wear out first, but the rears usually fail from inaction. Window switches can need attention too. The switches can come apart for cleaning.
AMC electrical, like my Lark, are mongrels. They sourced many parts from vendors who supported the auto industry as they couldn't afford in-house tooling for much of their parts.
You may see names like Autolite, Prestolite, AC-Delco/Remy, etc. You may be able to find brushes & bushings, etc, if needed.
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The radiator may not be original. Possibly the original shroud didn't fit and was left off?
Measure the fan blade diameter (many of these were standard sizes). Measure the fastener spacings on the radiator surround.
Use the part number as a search & identifier reference, but there may be an underlying reason that the shroud wasn't reinstalled.

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Thank you so much. The motor is missing from that door. It appears the prior owner took it out to fix or replace and never did. The radiator is the original and we need the shroud that is missing. The car has a/c and it is essential.

Thank you for the diagrams and information. Most helpful in our search.

 

[Elp]

We have narrowed down exactly what we need. Motor part 24.205 and the Worm 24.203. It's a long shot! Thank you.