Any 2.2 wheel, like the stock old pede wheels. You will have to have the different offset front and rear wheels to keep the track width correct.
Front:
http://www3.towerhobbies.com/cgi-bin...?&I=LXJF50&P=7
Rear:
http://www3.towerhobbies.com/cgi-bin...?&I=LXJF49&P=7
You can get them in white to and dye them. I use the fronts on my crt.5 all around with gladiator tires and they work great.