To answer your question, no, I don't think so. Pre '50 are Huck style brakes, '51+ Bendix; although this information does not answer your question re: wheel cylinder diameter.
I was reading you "log", instead of paying for a high priced new or rebuilt single master cylinder, go for a dual (safer and it's cheaper too!), it's a good time for it as you will be repacing your brake lines. Do a 'search' for dual master, many here have done it.
Welcome and keep us posted!
~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer
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