Originally Posted by DGthe3
I don't see 'Z28' in that picture (I have the book, no scanner). Looks like it is just an intermediate design from when they were trying to figure out the design of the rear end. Look at the orange car in front.
I think the rear end design was already set because both models are the same with the exception of the as yet released wing and the rear diffuser and tail light with top cross overs. The hard parts such as the bumper profile is the same as production. Plus the tuning fork wheels is too close to earlier motor trend reports.