My brother (the idiot) has just bought a brand new TT 225, but forgot to spec a cd player. Because of this, he is after a concert 2 stereo to replace the standard tape player. Can you fit the concert from any other Audi models to the TT? I have measuerd the aperture size in his TT and it's 22cm, my S3 is 23.2cm, so I'm guessing probably not??