Ok, I thought so.
I have this part 51 21 8 400 194.
Just arrived. Its the right door handle without a keyhole in it. Its pre-sealed.

Comparing this with the rear handles from an E36 I am trying to figure out the difference. Cant find an obvious one.
Now to order this part 51218400193,which should be the opposite side with no key locks.
Anyways, I am about done with this project.
Does anyone here want some estoril painted door handles? I am having my stuff painted, and you can piggyback if you have an estoril coupe/roadster. Just let me know.