I never got to comment on the fit of the SRT8 Grille Decorative front on the Laredo Grille Backing.
The only thing that I didn't like about using the SRT8 decorative cover and the Laredo backing combo was that since the bottom clips on the decorative cover didn't engage into the backing there was play between the decorative cover and the backing, meaning when you push on the grille it moved about 1" or so in. This bothered me as when I washed my car I was able to tell that the grille really didn't belong there.
My solution: Black Bumpers
20 ea 730" OD x 694 Long Push in Rubber Bumpers for 090" Max Thick Panel | eBay
I looked at the Grille in detail and noticed areas where bumpers/spacers would be able to be fit that would stop the movement/play between the decorative cover of the grille and the backing of the grille. I drilled 3/8" holes in their respective locations and forced the bumpers in. Once I was done I reattached the decorative cover to the backing and all the play between the cover and the backing was gone