It is just slightly over size(length), but our Mamba X is designed to run any sensored or sensorless motor with any pole count on up to 6s(depending on the max rating of the motor) without issue.

Length: 2.14" (54.4mm)
Width: 1.39" (35.2mm)
Height: 1.18" (30.0mm)
I just measured one to be 20.11mm without the fan. A 1/10 4wd buggy should be no problem and the fan should not be needed.