Remove them from the vehicle and place into a cup of really hot water for a few minutes. Then, remove from water and "flatten" them out by hand a bit (bending the tabs outward) while they cool. This will ensure tabs grab the housing a bit tighter eliminating rattle. Repeat if they begin to rattle again in the future... i.e. another 14 or so years (on your '99).
Good luck
Threaded Mode
