From what I understand and motors I got, there are basically 2 different axle diameters for 540 size motors 3.17mm (eg. HW 13.5T sensorless brushless) and 5mm (Tenshock SC411).
Besides axle diameter, you should also note the mod of teeth required, eg. 48p (Kyosho Sand Master), 64p (Tamiya?), mod 1 (Team C TS4), mod 0.5 etc.
OTH, for the program card (ESC program card?), what ESC and program card are you using?
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