Plastic glove box liner

The glove box opening on my '74 Duster is identical to the one on my '71 Dart. My Duster has a build date of 6/04/74.

And they both have plastic liners installed in them now. :D

I don't know what to tell you then, other than the pics show the obvious differences. Did it originally have a plastic liner or cardboard? I would guess that a pic of both of those glovebox openings would be revealing.