Good luck. I have been trying to find parts for a while. Your best bet is looking for someone who has one for sale in the "Sell/Trade" part of this forum. Also fleabay might have a decent parts engine pop up once and a while.
Yokomo YZ-2, B-Max4 III
Losi 22b, XX4 Worlds
Associated SC10.2, RC10B2, RC10T2, RC10