SE Datsun Brakes
Order from these Links
Clutch Master CYL. Napa about $25 #39102. Repair kit 1287
Reflector Discussion Threads
Replacing the Factory Cylinders
Kurt offers this option.
Not sure if anyone else did this or not, but I changed my master cylinders to this kind:
I ended up using swapping the rods out of the standard kit supplied master cylinder. They fit perfectly and bolted right up. They are a Whole lot cheaper and much better made.