The MMM motor will fit the Losi mount, but you need to use M3 screws to fit the motor, but the motor mount fits M4 - Some people have drilled and retapped the face plate of the motor to fit M4 screws - but you don't need to.
The Losi conversion kit includes the plastic spur - but you don't need to run one or the other. Go with whichever fits your gearing better.
__________________
|