I picked a Chinese mini mill. But controller is shot. so i got a Gecko G540. I need help with the stepper motors.

3 are Vexta DC 2.4 amp numbers on the lable are.
103H7124-1142
C299 581

Z stepper motor is a Vexta
3.1V 1.55amp
C8513-9012K
0441

All are 4 wire.

I called Vexta and they said those are com numbers.

Any help on how I can tell whitch are the A and A- and B and B-?