Ahhh, now I see the difference between a "clone" and a genuine Tomy motor. I just got a Hot Wheels K.I.T. (made by Tomy) racer from Target ($6), and here are the measurements of the motor:

Diameter = 6.07mm
Length = 11.85mm


I'm assuming that the KIT motors are the same as the BCG motors. The KIT racer also has a 50mAh Tomy NiCd cell. Someone please let me know if my assumption is wrong, as I am a microRC-n00b!