I have searched a few times. Spoilers by Randy was one the better looking spoilers I think he is out of business. The two piece t/a- aar are nice also. This one pictured wraps around the sides and looks made for the application. I maybe wrong though.
Cant tell from the small pic , but ''randys spoilers'' sure has a nice looking one for the 67-8-9 fishes .
I read that some 68ish camaro spoilers can be made to work too---
I`d like to have one for cooling help , but my car is pretty low to start with now .