I assume you don't have any wheel cylinders installed at the moment to study?
You might be able to get some answers to your questions by talking to these guys:
Brake Materials & Parts Inc
Specializing in antique, vintage, classic, obsolete, unique and hard-to-find brake parts, bonding, riveting, rebuilding, drum and rotor machining, custom made brake hoses
800 Sherman Boulevard,
Fort Wayne, IN 46808
260-426-3331
http://www.brakematerialsandparts.webs.com/