http://blauewolkebodensee.de/de/ In the photos area found pics of Heike in 2005, 2006 and 2007 This club is right in the area where the car was purchased. It looks like it had a roof change at some point, but many specific ID markings make it my car for certain.
Here is the car in 2016 (10 years later) when I got it. I looked at the roof attachment last night and can see "newer" fasteners. The major items you can see, the seat covers are still the same, green band across the windscreen, twin chrome tail pipes, early front turn lights, yellow and chrome trim on the wheels. The plates help as well. The "SIG" is from Sigmaringen, the village where the car was purchased. I'm betting that aftermarket sunroof leaked like a screen door submarine and at some point was changed out.