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If you don't have Onstar it looks like just plain GMCO for the stereo and the GMAHCM for the chimes. If you do have Onstar use GMAH24 instead of the GMCO. I will throw out the proviso that I'm basing this on their application guide and haven't used these modules personally, though others have.
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.