Grundig Fine Arts One vifa c20wn-05

Hello my friends. I am from Poland and I have a little problem with my speakers from grundig fine arts one. One loud vifa c20wn-05 from this speakers are destroyed. I try to find some but this is very difficult because this is old stuff. Maybe you can help me and you will find something for me. Maybe somebody has got loud for spares and want sell it. I will be happy if you'll help me.
Otherwise I am big fan products of gundig so if you can help in find stuff like grundig fine arts one, two ,three or five etc i will be happy. Maybe you can tell me adres in germany where can I find something like this. I am waiting for your answer my German friends. Best regard Krzysztof Laufer