How I did it was converting to sumo wheels, hubs, tires, fork, shock, rotors and front brake caliper and master from a Husaberg FS model. :cheers:
You can also buy aftermarket kits; wheels, hubs,tires, rotor, caliper relocation bracket from places like motostrano.com, epicmotorsports.com etc.. Check out the forums at SuperMotoJunkie.com for everything sumo.
Your best bet, IMHO, is to shop around for used ktm or husey parts, and find out what fits your bike. I think(?) your bike uses the smaller diameter axle(s). Or lace up different rims on your hubs. I got the most bang for my buck by buying used. Good luck!
jz