Fork tubes....look for original equip only. Don't buy the cheap Chinese after market, you life depends on good steel. Now is hard to find, I was able to spot a pair on yahoo japan, but paid fair amount. If you just need to re chrome try forks by frank in us. Mine were beyond repair.

Fork seal and Sprockets...TYGA

Chain...any reputable brand. O-ring for street, non o-ring for track.

Tires...Dunlap Alpha 13....used on KTM 390 cup bikes. Nice compound. Pirelli makes a size to fit as well.