Weren’t those things an amalgamation of other car parts? I seem to remember them needing a windshield from like a 2-year period of Corvette. Nothing else would fit, and there were a lot of other so-called “easy to find” parts that ain’t all that easy to find anymore. And there was a BUNCH of stuff like that. It seemed like just about anything came from a different car and never the same car for two different parts.
Whomever built them had to have been resourceful in their search.