Thank you very much for the answers.
Yes my 2nd thought was that I will buy a 7x16 wheel and use it with a 215/60 tyre. Thats pretty close to the 7x17 215/55 combo.
Anyway yes it is a pain to find this type of wheel....I spent countless hours on the net
Thanks again, nice from you that you answered in English on a German forum.
All the best