Here is a compilation of the Reflector discussions regarding parts for the "Old Style" non toe brakes. The master cylinders are available at NAPA, they're from the old Datsun B210, part number 39102 for new or 1287 for the repair kit.
Clutch Master CYL. Napa #39102. Repair kit 1287
Brake Cylinder Question
Brake Rebuild
Sourcing Master Cylinders
One New One Used
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