Gasman84470..... Not sure, but I think what you are thinking is that the vinyl roof was an aftermarket add on, but all Superbirds sold to the general public had vinyl roofs to hide the seams for the modified rear window mounting plug. It was the quickest and most inexpensive way to fix the problem.
Mine is still the original top.
C'mon guys..... lets see some more cars...... I'm not even close to liking Chevy's all that much, but really do like the Camaro that Toys4Fun has posted.
Quick trivia Q....... what was the Camaro originally going to be called, until another car manufacturer used the name before Chevy was able to?