Newbi question - B4

[DJ's Dad]

Evening. Trying to build a car with my son and found out during the build that we should have ordered a motor pinion with the car - dugh.

Looked on a couple of webshops and couldn't see a huge choice of pinion gears from Associated - can we use other brands and get the meshing correct?

Any pointers appreciated - he's pushing me to get it built with him so he can attend a club event next week for the first time.

Just thought of another one - I'd assumed the motor shafts are/were all a standard diameter? We've bought a Speed Passion brushless motor/esc combo.

Thanks