Too bad they can't be rebuilt. Not that complicated, just a rubber diaphragm in there right? Probably like thin bicycle inner tube now but shoe leather thick in the old days.

Matthew 6:33

1952 Chevy 1/2-ton 3100
Late '55 235/SM420/torque tube 3.55
Dalton Highway survivor (using original 216)
www.truckwithaheart.com