Russ I'm scrapping out a V730 tranny, do you need any parts from it. I used to get those spacers from 2 places 1 in Chicago and 1 in New Jersey, but thats been 10-12 years ago. I'll see if I still have the addresses. IIRC the one like you show is a drain back to the pan, it has a what I would say is a lip in it to catch the oil that lubes the input shaft bearings, the flywheel acts like a pump to do that. I have a bone shaft (engine to tranny) if you want it, they are hard to come by.
Don't know if you know this, but the engine rear main seal has to be changed to a two way seal when you go from manual to auto.