I believe this is called the roll pad not sure .. it is the pad underneath the targa top in toward rear of interior

nice crack in it ... how in the world it cracked it's under the roof and gets no sun .. I gets after nearly fifty years just the Texas heat will do this with a car sitting in a garage.

does anyone know a way to fix this ... some kind of filler? or would you consider this toastClick to view attachment

It’s common for them to crack at the hole.

You can try to fix it, but you will probably never be satisfied with the result. Sell it to somebody that can live with the flaw and put the money towards a new one from AA or 914Rubber.

Ansbacher

Go new. You won't like the patch. BTDT!!!. Easy swap out. Keep the screws loose until you get them all started (duh here).