The XTR 2008 has OEM handlebar dimensions of

Width 775
Height 100*
Rise 65

The bars I have just bought, Renthal 613, (fingers crossed that they will fit!) are:

Width 830
Height 130
Rise 95

If I have to reduce the width by 60, (to 770) it would give me a height of 120. So, I hope they will fit ok without removing any material.

To be honest, they really don't look that much higher anyway. I may have to go the route of bar risers, and possibly get longer cables, to get a good and noticeable height improvement.

What I am looking for is a much more comfortable "standing on the pegs" position, at the moment it feels like I am bending down to reach the handlebars.

* I had several different measurement results between 100 and 115. It is very difficult to get the handlebars flat and at 90 degrees for measuring. This is how the motocross shop told me to do it, i.e. have them totally upright on a flat surface (table).

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2008 XTR Mods : DNA Stage 3 Airbox, PC111, Carbon Cans Ovals, Steve Ruth built XTR734cc Big Bore with - High Desert Dyno (HDD)/ Cuervo Racing Gas Flowed / Ported Head fitted with +1mm Valves & uprated Springs, HDD 5050 Camshaft, HDD +3mm Throttle Body, CP 105.5mm 11:1 Piston, Custom Mapping, Piasini ECU, Renthal 613-01, Barkbusters VPS, Pivot Pegz, Touratech Bashplate, Foam Grips, Kev's O2 Sensor Mod, Kev's Extra Coolant Cooler, Wilbers Progressive Fork Springs and Rear Shock