I have e-mailed the Stabilus Ingenieure "auf deutsch" and asked for the correct number. If they give it to me, you should be able to order it from here:

Nord Amerika / North America
USA / South Carolina

Fahrzeugkomponenten - Ersatzteilhandel /
vehicle components - spare parts trade


Sachs North America, Inc.
909 Crocker Road
44145-1095 Westlake, OH
Tel.: (440) 871-4890
Fax: (440) 871-6904

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Prost!