Extreme Flight 2 Meter Vanquish F3A Assembly Manual page 39

32. Mount your motor with the 4 supplied screws & washers. We have
provided enough space to mount most makes of outrunner motors currently
used in pattern/F3A flying. If using the recommended Torque motor we have
supplied plywood spacers to provide the proper distance between the face of
the motor box and the spinner back plate.