Please note that these motors come with mounting holes that may not accomodate every frame. If you see slots on the frame motor mounts, chances are they will fit. If the frame has holes for motor mounts, you may only be able to fit two screws as most motors in this class have mount holes with one pair spaced at 16mm and the other at 19mm. The RR motors are 16x16. You can probably file/drill the existing frame to fit if it doesn't already.