Thanks, I did actually find the site you sent me while continuing my own search. My confusion was with the word "strainer" used in Bentley. I picture a substantial, reusable, metal mesh, when I read the word as opposed to "filter" which I associate with a replaceable paper cartridge.
I must be over thinking it!
I plan on buying the filter and gasket kit and doing a atf change.
Bavauto says that a Black label on the pan indicates that Dexron III was used as original. A Green label indicates 7045-E was used and that BMW recommends 7045-E.
I have read suggestions that you should drain the atf after a short amount of driving and then refill because you cannot get all of the fluid out even when the pans are off. The second change mixes with what fluid was left and makes for a more complete change.