FWIW,
I did own two 'Brass Hat' cars, one was a 1990 Pontiac Turbo Grand Prix, and a 1970 Shelby GT-500. The Pontiac was used by GM exces from the Thousand Oaks region (LA), and was sold through its dealer networks where I bought it. I purchased the Shelby from the original owner's wife (the husband was a Ford employee aka 'Brass Hat') in 1984. Anyways, the reason for my rambling, on the Shelby it was an unusual build from the norm. It had non production parts, and experimental items (in Ford speak called 'XE'). My conclusion is 'Brass Hat' cars can, and did have unusual parts/items assembled from the normal...at least from what 'I' have seen. Is it possible GM did this also? On this Camaro? OR as some stated its a fake?