They are probably obsolete from GM, but may still be available from NAPA. And there are specialty houses that just deal with brake parts. One I can think of in Minnesota is Brake and Equipment Specialty Inc. But I just hit Google and found about 600,000 hits from "heavy truck brakes parts". I doubt the parts you need are all that rare, just inconvenient to find.
If all else fails, the restoration car and truck people have machine shops listed that will bore and sleeve your existing wheel cylinders, but that will probably cost more than finding new ones.
There are still a lot of these old trucks used on the farms, and the parts market is supplied by many shops and small manufacturers. Often the big companies just want to deal in the high volume relatively new stuff.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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