http://github.com/Ultimaker/Ultimaker2
Contains specifications of all the parts.
(And if you are the person who is in contact with Chris McAdam of support. Then please listen to her, as when your prints are tilted/shifted then that's a pulley issue, not a motor issue. Motors almost never break. If you are not that person, then ignore this message)
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pm_dude 27
They are not available on the store but maybe you can contact support for a replacement part.
The closer I can see these motors to be are NEMA 17 stepper motors but I have no clue if they are the same so don't jump on those blindly.
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