[Mr70]

That's a seat trim sheet.
Try looking for the buildsheet behind the door & rear panels-behind seat backs-under package tray cardboard-inside Headliner & ear muffs-under both Ft. & Rear seat buns-top of Gas tank-under carpeting-under floor sound deadner-under the dash & dashpad-taped to top of the radio-kick panels-engine the compartment wheel wells to fender area too.