A500 or A518?

Just curious...what were the 42RH trans found in and what years? I have a 46RH that I will be building but I like the idea of lighter/smaller trans and lower 1st gearing at my HP level.
It
I think about 89-95 in Dakota trucks and jeeps. They went to the electronic RE version when they went to the OBD2 system. Not sure how many made into full size trucks and vans.
A friend has these pictures from a a500 that is far from us and unable for now to took more pictures.. we can't see the plug.. is there any other way to see if it's a 42RH or RE from these pictures?

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