My local NAPA store found wheel cylinders for a 54 GMC 530 series in a warehouse way out on the west coast when I needed them- - - -at $94.00 apiece. Instead of doing that, I honed the ones I had several thousandths oversize, and ended up machining new pistons for them. The original-size rubber cups (also provided by NAPA) were flexible enough to provide a leak-free seal. Ask Ed if they're still working- - - -I believe they probably are.

Are you approaching NAPA with the same attitude you're using here? You can catch a lot more flies with sugar than vinegar.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!