Hey Paul,
I always use the RW Racing pinions:
http://www.rwracing.co.uk/cars.html
Give Neil a shout and he'll sort you out with stuff, and has a bigger range than the standard stuff from Schumacher incase you want something a bit different.
P.S. check out the electric forum in about 5 mins Paul - Im about to post up my FrSky conversion page
PPS - I also use Neils spur gears from RW Racing for the SX3 - I find them to be stronger and live longer than the Schumey ones.
