i had some new spacer made by twowheels (steve Beane) that enabled me to use the GG wheel, bearings and seals with a yz axle (it sticks out about 15mm on the RHS)
for the brakes you will need an adapter to convert the yz caliper to a 260mm disk (made by braking
http://www.motorcycle-superstore.com...mm-front-rotor)
And lastly i just had a GG top triple clamp machined out to match the yz forks