I think the Bulova part #'s are #16B for the male (crown side) and #16C for the female movement side. The length on my old female movement side is 9.88mm. My Bestfit catalogs don't list any stems for the 10BZ.
I want to thank John (JP) for taking the time to look through his stems and sending a few candidates. Unfortunately, none of them will work.
I can trade a crystal if you need one or $$$.
Thanks