What are the most likely Donor vehicles for the A 500 4 speed automatic?

Interesting. Did you notice what PCM it had? One big plug or 3 smaller ones? PCM would have been black or silver, black for SBEC or silver for JTEC.

Maybe it had a GC TCM wired into it. No idea that there was a TCM for an RE until just now.
Well I don't remember for sure, it was a whole 4 weeks ago, lol. Just remember it had way more than 2 or 3 wires going to the connecter plug and no K/D. After checking the door tag I turned and walked away in disappointment.