I believe this is about the spring on the bottom of the shifter. (this would fix a noisy/vibrating shifter.)
to remove your shifter, remove the shift knob by turning back the lock nut and spinning off the knob. Then remove the shift boot covering the base of the shifter. then use a channel lock and twist the round metal piece counter clock wise about an inch or so and pull up and remove it. then you will see two rollpins below where that metal piece came off of, use a punch to remove them from the inside out. and pull up on your shifter. You then should see what you need to do to replace them. reinstalling the shifter is the reverse of this. btw you may also want to check into some new bushings or whatever else is in the shifter that could be worn. when I did mine I only replaced the shifter as i found a chrome one at the u-pull-it, but once the shifter is out I can't imagine it is too hard.
btw, almost forgot, set your park brake and put the trans in neutral before you do this.