It may have been mentioned earlier in the thread, but
Auto Addicts makes an almost perfect replica kit. I had them install it and the fit/finish is indistinguishable from OEM. I know it is not right from GM, but it will get your there! Rear wing attached for reference.
They also make Carbon replacement pieces for some of the front vents.
Good company, good team. I had them do wheels, tires, springs, alignment, and a few other things. Nothing but good things to say!
(Not affiliated with them in any way).
-eric