My shifter had gotten really sloppy, lots of movement side to side even when in gear. It wasn't so bad as to restrict my driving, but quite annoying nonetheless.
I ended up replacing these 2 plastic bushings right underneath the shifter. See website for diagram. Now its tight as can be, and my car feels brand new again! Yay!
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The part I replaced is number 5, it cost $4 at the dealership. Now that I know what they look like, I may try to have some aluminum or brass ones made up next time... Anyone have a source on these?t :)