Thanks phrogs for the part numbers. GM parts direct shows all of them except the 14049033 are in stock, and it says that isn't available because of size or fragility? I guess I'll call a local dealer (the one I always used just closed up after decades - what's this world coming to?), but it looks like all the parts are around.
I have a deal pending with a local member for his crated repro. Hopefully it'll all be back in and settled by the end of next week so I can get back on the road.
P.S. jrd1990zr1 thanks for the suggestion, not a bad idea. I'll push a little and see what I can get!