I found a review in the UK and it said that the conversion is limited to 39mm. So, I looked at the Losi Xceliron and Speed Passion combo's. Both seem to still be in the development phase, kinda like MM v1 and v2. I don't have time for that.
I couldn't find a Neu 1415 at my normal online hobby shops and twisting the motor would line up the top screw, but made the bottom screw even more off.
So, without turning to Novak, I found that I could install a second spacer:
http://www3.towerhobbies.com/cgi-bin...?&I=LXXLY6&P=7
I am just not sure that it will leave enough screw in the diff braces.