Dave,
Just got all the stuff for my '55 first series 4400 (Bendix Brakes), except shoes from my local jobber, who plugged in Wagner numbers and got all the stuff aftermarket.
Almost $300 for all the wheel cyls & hoses.
Only thing I had to substitute was later ('64-'8?) front wheel cyls because the '55 - '59 were N/A. Only difference was the angle of the boring for the brake flex hose.
You might also try looking in Raybestos - they still had complete wheel cyls for my '36 Chevy truck a few years ago.
Good Luck!
Frank McMullen
