Mr Fuak is the best guy in Vientiane he's got most things in his tiny workshop. you will be able to find his address on GT - rider web site or just ask any expat on a bike to shop you. If he doesn't have it, he maybe able to help you source it from Thailand. The option you have is getting it sent over from Thailand - again GT-rider has all the information. PhnomPehn is another place you can get heaps of motorbike gear/parts from if you can hold out until then! In the mean time.... don't load up bike up too much and take it real easy over the bumps! I've travelled a long way on the last notch!
For more information on my adventures, please visit either of the following: