Yeah, they used those parts for a few decades. A few years back we ran into the same issue looking for a set of wheel cylinders, adjusters, and shoes on an 80's model c70 box truck. None immediately available, anything that could be had, would be a week or two out at best. A couple places offered to rebuild what we had, but I didn't get a warm fuzzy feeling from that.
They ended up yanking the box and scrapping the truck. The box was really the only thing valuable to the truck.
Can't do that with a bus, but you can swap axles out to ones off something more modern.
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