Seaker rattle!? help

Hey,
in my 94 gtp i have quite a system and the rear speakers rattle like hell to the bass, but its not the speaker it self its the mounts that they are on. For anyone with a system in there older GP if you know how to stop the rattle let me know im gettin pretty annoyed by it!

Thanks
-Jason-

try some rubber gromets on the bolt/screws holding the speaker in.

Or mabye some dynamat