In an effort to help Jim (Jim I'll delete this if you want) there was, as he has, stated some variations on this Shelby part:
As best as I've been able to tell;
There were two gauges of material used, initially heavy and then lighter.
Some with an “open” area in the license plate segment, some (most) “solid".
Some (early) had a hole in each of the tri-angular vertical end plates.
To my knowledge any will fit either the center or outboard grille light cars, it's
more an issue of which would a particular car have had.
Yet another '67 Shelby part variable with little, or no, time line of version
use/implementation.
On the good side they were all semi-gloss black!
Hope this helps with understanding (some?) of the variations.