We have several tools we use for parts etc, mostly what BMW uses at the dealership and none of the numbers on the trans are recognized. The guys at www.2carpros.com
were able to come up with some info so I'll post it here in case anyone in the future has a similar issue:
5 speed transmissions for E-28 535 late production
also fits many others.
23-00-1-221-208 is the part#
Thanks for you time guys.