Master cylinder, try to save your old one so it can be sleeved. The bottom mount style used on C15A is rare, particularly in the required 1.25" bore. When the 1" bore ones show up on e-bay they are usually described as 1936 Chevrolet.
Wheel cylinders, backing plates, etc should be Ford parts, so consider Mac's or other Ford parts suppliers. Bob Carriere had luck taking one of his wheel cylinders into a local heavy truck repair shop and having them compare it to their catalogues, the shop sells Wagner hoses etc so the cylinders might have been Wagner too?
Same logic for brake shoes. They can be relined if the underlying parts are solid. LWD parts lists NOS shoes, or Mac's sells likely looking shoes (but I haven't checked parts #s). Check the C15A parts book, take the Ford style numbers and enter them on Mac's site, I've seen some parts show up on this method.
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