914 Wastegate Servo - Replacement Motor

The brushes in the motor within the wastegate servo are worn away. There are no identifying numbers on the motor and I have been unable to find a replacement by Googling images, although there are many that look very similar (door lock, mirror motors etc). Does anyone know of a source for the motor or a manufacturer/ part no ?

Have just discovered that the servo itself appears to be a Kawasaki Exhaust Servo, product number: 211740003 (now superseded by 211740005 - not sure if this would suit a 914). Lots of complaints in the motorbike world of the brushes failing !

Thanks, Mark