Sunroof Issue

My car a 98 Z24, Has a full coil-over suspension, thus making the ride alittle stiffer. As an outcome my sunroof has started to rattle on semi rough roads. Not a loud rattle just a low "get on your nerves" rattle. My question: Is there anything I can tighten, remove, replace to stop this rattle. All the rubber around the sunroff seems in very good shape. Thanks in advance for any ideas.