I bought it directly from Stepper Online. It will not fit the NEMA 8 motor mount sold by Servo City (aka Actobotics and Robotzone). As another customer pointed out, the motor has a circumference of 16.0mm and a bolt hole spacing of 15.4mm, which I measured with a caliper. In contrast, the motor mount has a diameter of just 15.75mm for the guide circle and a hole spacing of 16.0mm.
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