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You'll need to carefully examine the connectors for part number information and then buy them through someone like Mouser. I don't show those as being sold separately by GM. I'll dig around and see if I have docs showing the part numbers but the odds are pretty low.
The part numbers can be anywhere on the connectors as these examples show, and then you have to figure out the manufacturer. GM used a lot of different connector vendors on these cars....
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.