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I don't have a 78, but you might try the web sites of vendors like Corvette America, Corvette Central, or the Last Detail. I found the picture on the web. Good luck. In regards to your earlier post, Automatic and manual crossmembers are different. The manual is welded to the frame. An automatic is different.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.