It's a pretty simple fix but some pics and a few soothing words might help out the newbs, so here goes.
OK, we'll start out simple. Here is the shifter
Unscrew the shift knob (it comes off anti clockwise), and undo the four bolts that hold the shifter boot to the transmission tunnel.
Once you have removed the shifter boot you should be presented with something like this
Carefully peel the rubber boot from the flange and move it out of the way like so. You can see the 3 bolts holding the flange to the transmission housing. Make sure you have the transmission in neutral and undo these bolts.
Pull the shift lever out of the box. When doing so make sure that you pull it straight up (eg, vertically) to avoid putting the box into gear. This will make it easier to put back together
. Once you have removed the shifter you should see something like the following pic. In my case the bolt had fallen out all together 
, so all I needed to do was to put the new one back in and replace the shifter. You might also want to take the opportunity to replace the shifter sheet at this time. The shifter sheet sits at the bottom of the shifter housing and gives the ball part of the shifter something to sit on. Mine was OK so I did not replace it.
Here is the new shifter locating bolt in place. For reassembly just do things in the reverse order. Just be careful putting the shifter back in, if you have the box in neutral it's pretty easy.
There are 2 different sizes of bolts. I am not sure if one size suits NT zooks, and one size suits WT zooks but I suspect this may be the case. For the record, mine is a 90 model WT and it used the smaller size bolt. Part numbers are 09135-08006 for the small bolt and 09135-10005 for the large bolt. You can get these from your Suzuki dealer as a genuine item, they are not expensive (around $10).
