Thanks!
On your Aerokit/Toth tests, I'd definitely do either one
or the other. I think I like the Aerokit better. I also checked EOMAK's Z-top/wing, and it appears that it is not an OEM GT4 style/uprights, so I'm still unsure how that would look on our older cars.
Are you painting these parts at home? They look well done at web resolution!