My search is drawing conflicting results. The two vehicles in question, both manual drum cars. 1st up, December 69 built 70 Super Bee. second, August 71 built 72 Challenger. What are the "correct" Bendix (?) manual drum master cylinder #'s. An advanced thanks as usual.

The first one is pretty common, it is the bolt on cap style that was used on most drum brake Mopars from '67-'70. There are several different Chrysler part numbers used, 2808577, 2808599, and 3420961.
The easiest way to identify them is by the casting numbers, the most common casting numbers are "2225601" and "2660809". I've also seen them with "AANF". Physically, they are all the same regardless of which of those casting numbers you find.

The one for the '72 is fairly common too. It is Chrysler number 3461184. It would have casting number 3461189 or 3580006.

Thank You Master!!!!!
And Thank You Steve for the PM!!!