I swapped my bushings for aluminum plugs. It wasn't too bad, remove the trim panels, space ball, etc, then one at a time, remove the bolts and the rubber bushing. I found it hard to keep the plugs in place, so I used a little double sided tape to hold them in position. Once in place, loosely thread the bolt in to keep it in position, then move to the next one. Once all 4 are done, tighten.
It wasn't a terribly hard project, there isn't much room to move around in, but in the end I'm not sure it made any discernible difference. Was easy enough though.