I fitted my kit today, the blocks needed to be taken down a whisker as they were too tight in the swing arm(only slightly). The kit comes with an aluminium nut which I personally don't have a great deal of faith in, so I used a steel Yamaha nut mentioned in the thread below.
http://www.gasgasrider.org/forum/sho...86&postcount=8
All in all the kit is well made but by the time it's landed in Australia the price is a bit exy.