Help finding the stock speedo drive head

[MountainMax]

Im trying to find the stock yamaha speedo drive unit on the parts locator at www.yamaha-motor.com for my 06 WR450 and I can't find it listed there, am i missing something? I can see the gear drive unit for the 05 wr's but not the o6 models, can someone please helpl me out????? i used this pic for the front wheel

[simon@vic]

look in a section other then front wheel!