There is a small nut on the inside that you can tighten and they will be fine. Start with the one on rear, you can go through the vent hole and get the size you need. The front one IF you can get your arm to it through the panel . Tie a string or some kind of tether to your wrench. The front one you can drill out the rivets and then re-rivet it in place after tightening it. Good luck. Bob