I'm thinking about my 1980 Burro
and which parts of it have been hard to replace...there's the door - those are not replacable with stock parts. I'm replacing my windows
right now and have to go with custom manufacturing since these are not standard.
But for everything else I can remember that we replaced or upgraded, it hasn't been hard to find stuff. Oh, well, we made our own replacement cabinet doors because the originals were particle-board bricks - I saw no value in either keeping those or recreating in the spirit of the original! I also had a spare tire carrier fabricated to my specs.