I need a 64-66 Mustang Trim Expert

[impala]

I recently acquired a large collection of parts and included are these left and right rocker panel moldings that are unmarked. They appear to be 64-66 Mustang but I'm looking for confirmation. I suspect one is NOS Ford and the other may be a reproduction. Is there any way to tell? The reason I think that is the one I suspect is NOS has tiny markings along the inside of the lower edge to locate the mounting clips, see 4th. pic. The marks are about 12' to 15" apart. The overall length is 77 1/2" and 2 13/16" wide. There are no other markings at all except for the clip locations.

Any help is appreciated.

Thanks,

impala