Hmmm I have no idea. Mine are "tight" -- in that the spring loaded receptor on the door pillar is tight when the door is open. When the door shuts, the other piece (on the door) slides into it. I"m not sure why it rattles...... I suspect this is unique to convertibles as these are meant to provide additional support to the doors ..... Perhaps someone else out there will chime it.
VT Mopar