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They use 57U as the Color Code, so that's what I based it off.
paintscratch has an interesting mix of option codes and paint codes. For exterior colors where they list the option code (such as 57U), that will suffice (provided you have chosen the right year, make, model). However, if you want something other than an exterior body color, you will need the paint code. For example, the paint code for competition gray wheels is WA9243.
The OP asked for the paint code, so I'll stick with WA637R.
FYI, you can google "2009 GM color compatibility guide" to find a GM document with a full listing of all their paint codes.
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.