I've ran into similar issues with old parts that are no longer supported.
The problem is that certain things aren't really wear items per se, which is why you're having issues finding them. If bendix says they're unavailable, they likely are unavailable.
In the reman process, they might make 8 reman'd components from 10 cores, which is why not all parts will be available.
I don't think they're making new versions of that compressor anymore either, which hurts your chances of finding it even more.
I'd see if you could find a used one somewhere to scavenge what you need. Other then that, you're pretty much stuck with buying a reman compressor, which you likely don't want to do after all the work you've done.