[1967 4K]

I should have explained further. A Nova hood is flat where these set therefore the louver is flat. A first Gen Camaro hood is a little curved- arched ever so slightly therefore the louver is slightly arched. Holding them side by side it’s still hard to see this but it’s there. Best way to check them is with a straight edge device.
The stud pattern is the same so they’ll fit on either hood but the flat Nova louver will rock on the Camaro hood. I think this is why you see so many original pieces with broken studs. Guys tighten them down to much when they’re not seated right on the correct hood.
I read all this not too long ago either here on the site or on the GRC site, can’t remember.