72 Duster Seat Belt / Headliner

Hi - Looking for a front seat passenger side seat belt (black) for my 72 Duster with a bench seat. It is missing the buckle belt piece that attaches in the center floor. If anyone has this or a pair in good shape let me know.

Also going to replace the headliner, sail panels and package tray soon. Any tricks or guidance for this ? Was going to get the ABS plastic headliner board.

Thanks !