That was great work mavala.....
I am a newbie to this site and forum so excuse if I am a little slow
. I would also like to install an auto dimmer rear view and if possible driver side mirror, one thing I did notice is that you are mostly located in London and UK.
I am in Atlanta USA and I have a 2007 A4 (B7) quattro, the installation instructions you gave is this only for european models? The rear view mirror in your pic looks different to mines, the rv mirror I have is only stuck to the windshield and doesn't have the additional base piece your's seem to have.
Do you know if your solution could work on my car? If yes do you have any suggestions on where I can purchase the unit?
Thanks again in advance.