Robins of all sorts are quite popular in Germany. (A few years ago I got my SEP on a DR400, and I love it!) So it may be a good idea to get in touch with one of the local specialist MRO shops. E. g.:
Kienerflug, Flugplatz Elchingen, Tel.: 0049-(0)7367-96560,
http://www.kiener-flug.de/
or
LTB Weserbergland, Erwin Hehe, Flugplatz Bad Pyrmont, tel 0049-(0)5285-555
or especially the German general importer:
Intelisano Aviation, Oftersheim, tel 0049-(0)6202-594411