well i cant answer anything about the motors but the bodies just fit straight on.
I got a few mr01 bodies and with the 1 that’s on it now you just need to shorten the body by removing the 4 screws that hold the back end (2 on top and 2 on bottom) see pic, change the spur gear to a shorter 1 and screw it back together and your off. although some bodies need that lay down crystal adaptor to fit.
