I usually use carfax.com, and just type in the plate. Just so you know, I haven't always been able to find any matches for vintage cars. (might be registered differently) Good Luck!
It can't be a Gransport because it has the wrong splitter and side vents for that. And it's definitely not a normal C6 because it actually has the splitter, extended side vents, and hood vent in the first place.
I didn't see any Z06 badges on the car either but that's the only thing the kit could match.
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