Metric motors are made in standard sizes, if you have a copy of the rating plate off the motor, then you should have enough information to identify a replacement.Have checked Machine Mart and they certainly have a lot of motors, I have asked for details of the hole centres and the height from the base to the centre of the spindle. I think these maybe a standard sizing but want to make sure.
Machine Mart would not be my first, second, or third choice to source a motor!