Hi folks In the process of changing my A3 2005 Concert II HU over for an aftermarket model. I have someone that wants to get their hands on it. Question is, are all models compatible with BOSE? I know that it will probably require VCDS, but are all Concert IIs BOSE compatible if a certain figure is changed via VCDS? Also, will the 2005 Concert II (think its ISO, single DIN) fit any other Audi models? Thanks in advance!