• Bar risers. I bought mine from Dirtly.com. Just send the guy an email and he'll hook you up.
• 12mm socket
• 6mm hex key
• Sharpie or other kind of marker

background.
Another modification in Operation Make XT Fit Mutant Tall Person. Peter had commented that standing on the pegs made him feel as though he was pitching too far forward; a common complaint by tall riders on the XT. I'd heard good things about Dirtly's bar risers, so I figured we'd give 'em a shot.

procedure.
The first thing you'll want to do is take your handy-dandy Sharpie and mark the handlebar and bar clamp. The bars will invariably turn a little bit when you insert the bar riser, and you'll want to make sure that you keep the stock angle.

Next, just undo the four bolts that hold the handlebar top clamp on (12mm). There are brackets on both the top left bolt (for the choke lever) and the top right bolt (for the throttle cable guide); neither will go flying anywhere, but just remember to pick them up if they do drop off.

Now, just lift the two handlebar top clamps off, remove the stock bolts, and set the clamps down somewhere within reach (the bike's seat works well ;) ). Grab the bar risers, put the new (longer) bolts in your pocket, and put the risers somewhere within reach as well.

OK, ready? Lift up the handlebars, stick the bar risers in place -- curved side up -- and replace the handlebars on top of the risers. I don't have a photo of this step, as I ran out of hands.

Next, set the handlebar top clamps on top of the handlebars. Insert the new, longer, bolts -- don't forget the choke lever bracket and throttle cable guide bracket! Thread the bolts by hand just until they seat.

Remember those Sharpie marks that you made on the handlebars and handlebar clamps? Rotate the handlebars now until those marks line up again. Once they do, go ahead and tighten down the bolts with a 6mm hex wrench.

That's it!

result.
Here are some photos of the XT with the bar risers. I'll update this page once Peter has had a chance to ride with the risers on. Incidentally, that gap between the handlebar clamp and the bar riser in the second photo is normal. The diameter of the handlebar is just a little larger than the depth of the handlebar clamp cut-out -- the same gap is there on my stock XT between the top and bottom handlebar clamps.