I hade to repair a 50 mm F1.4.
I ordered an nUSM micromotor module. I does not fit the lens.
After this, I have found the parts list on the net, and here is the motor:
Which I ordered, was the YG2-0453. In this case the USM motor has 5 pins.
The other one has 4 pins (YG9-0526).
check this cable