My first post! I've managed to treat myself to a A4 2.0T FSI Quattro S-line (2006) last month, but am keen to replace\upgrade the currently fitted radio as it has a damaged volume knob and some other button legends are a bit 'chipped'. I have a standard Concert II fitted but have the opportunity to fit a Concert II+, however questions arise: Is this possible? What about the 'rails' for fitting the stereo with the extra height needed? Are the connections the same? Would it have to be done professionally? Do I need anything apart from the head unit? Any help or advice would be greatly appreciated! Thanks.