Maybe you can find a used one. It seems like Jaeger isn't around anymore.
When I was a kid, we had a motor repair shop in town.. They used to strip them down
and re-wind the armature with new wire.. Too bad those days are gone..
As a last resort, you might have to ditch the motor and add-on a regular dish actuator.
There a lot of examples on this page:
LED3X Solar Tracker Assembly