Help Identifying Mid '80s Tub/Shower Parts

[RhodeIslander]

hi guys, we want to re-do our bathroom and I'm trying to identify replacement parts for this tub we've not done any work on since 1986 I believe (sorry for the photos!). I have a plumber lined up but was hoping to order the parts in advance.

The closest thing to the Moentrol we have that I can find online is a Moen Legend 3250 (with lever-based shower/tub selector)

But the tub faucet and drain, I would appreciate any information on what specific parts/manufacturer I need:

thanks!