Came across this set for a 71 B body...

I once owned a 340 auto air 340 EV2 70 cuda, it had rear window louvers and houndstooth interior with the orange "gran coupe" door panel trim. It had the textured rear window trim. I also owned a red 383 4 speed black top coded for rear window louvers with stainless trim (this car was a total loss). I have 2 sets of C body textured trim, from C body Gran Coupes, these cars had window plugs similar to the Challenger SE, but the windows were shaped like a cuda, but are not the same.

We have an untouched factory louvered 71 'Cuda in the area. same owner since 1971. the rear window trim is the standard bright trim.

They have been seen in both configurations of rear window trim, same for 71 B bodies..... dealer added louvers add to various combos too...

The car that had a set of textured rear moldings on it when I got it was a 70 Cuda with a 383, purple with white top and interior. No louvers ever on it that I could tell.