Is there supposed to be a plastic trim piece at the front edge of the headliner on 3rd gens, where it meets the windshield?

All I had was a folded metal strip piece (the width of the front edge) that fit into the unfinished edge, which I removed for now.

I finally got around to starting to deep-clean the nasty headliner and noticed what appears to be a discolored line covering

about 3/4" wide back from the front edge, as if something used to sit there and muck had accumulated around and under it.

 

And, if there is supposed to be a piece of plastic trim............does anyone have one they could part with? 

 

I believe that there is a piece of trim there on my '86 coupe, I'd have to look tomorrow morning to be certain.