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Looks like the U and L stand for upper and lower as mine are both bright red.
In the Corvette Black Book the OEM exterior code for bright red is 81 (confusing) and interior code for Red Leather is 732. So I'm guessing the 10T is for clear coat.
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.