I need a 12 to 15T pinion for a mamba maxx nitro conversion. Since its a nitro truck (CRT.5) I have a 1.0 module pitch on the spur (correct?). Where can I find a pinion for the 1/8th shaft of the mamba that will fit the mamba and mesh? I can find 5mm bores but nothing for 1/8th. Thanks!