Yeah, there is a great list put together by @GEMmechanic of where most of the parts on these cars came from here:
Lists of Alternative and Superseded Parts
My 02 is a former maintenance vehicle from a UC operated pubic transit bus line, so it’s kind of beat up in some ways, and well maintained in others. After reading that list, it was nice surprise to find out that most the little stuff that they didn’t fix really isn’t anything specialized or is easily converted.