The NOS 1972-74 Cuda lower valance incerts that we’re manufactured in the 1980’s-1990’s-2000’s are not the same as the original production line incerts from the 1970’s.
The NOS incerts being sold on EBay and Mopar sites are not the same as the originals. The sellers are not telling you how they are different. They are telling you they are the same as what came on your car when new.
Just compare your original incert to those newer 1980-2000 incerts, you will see how they are different.