Google something like "vintage auto air" and you will find sources for the older stuff, replacement items, and even new systems.
The old A 6 compressor is usually available locally as a rebuilt unit, and with the shipping weight, probably the best way to get one if you need one. There are also replacement kits using more modern compressors which are smaller and lighter weight.
Like everything else on a '74 motorhome, it takes more and more searching to find good replacement or substitute parts.
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