With the donor car... the latest ebay one, well it had white cogs and an esc, this was the only reason for buying it, to make son's car better.
You can only use the set together as there is a large difference in size.
Only reason they are missingteeth is due to being used on my original car from the mag and not having an esc with a brake.
Might ask my old workplace if they can knock up some alloy ones
