Need help with rear bumper for 65 Barracuda

On the 2nd pic there’s a special rubber bumper that is attached with a special (of course) shouldered bolt and another flat rubber bumper that’s attached to the underside just above the location of the first one as marked onnthe pic


IMG_6329.jpeg

EDIT: after i get back from the DRs I can take pics of the bumper and shouldered bolt