Hard to find stepper motor replacement

Hi all,

I am looking for a specific stepper motor as a spare part (for scientific equipment).... This seems to be kind of difficult as Rotalink won't sell to anyone except for licensed partners.

Motor is a Rotalink M234118C632 3-phase unipolar hybrid stepper motor (1.8°/step, 12 V, 0.38 A, 32 Ohms, 40 mH, 0.36 Nm holding torque, 0.03 Nm detent torque)

I was hoping that someone knows where to get a similar motor, as I am growing desperate here... I'm thankful for any hit you can provide.

cheers,
powerarcs

EDIT: Here's the datasheet