Don,
I used Brake & Equipment here in Minneaplois this past spring when I re-did the brakes on my 50 1 ton Chevy. Great place to deal with, they had all the wheel cylinders and master cylinder in stock, although I did keep my original master cyl. and had them re-line it with stainless. I had my front brake shoes re-lined there, only took 2 days and I was ready for assembly.
Tom