Plastic piece between seat and console

[95E320cab]

There is a piece of plastic that is on both sides of the console that surrounds the seatbelt receiver. They wrap around to the back corner of the seat and cover the seat hinge. Mine is starting to jiggle and rattle. I can't figure out what this gizmo attaches to in order to tighten it up. Anybody understand what I am trying to explain and how to fix the jiggle?