I'm using a goodmark full trunk floor with amd outer wheel and extensions. The floor is a good fit. The back lip (where it folds up over the rear tail panel) is alittle shorter than the ooriginal, but noting to worry about. Its enough to weld. It also seems to be missing two holes on the outer edges of the shock humps, and I had to punch the shock hump holes myself.
As far as the amd parts, the right side fit so well, they damn near fell in by themselves. The left needed a little 'love' from my body hammer.

...All on my 70 challenger rt...
Cheers,
Eric