When you have the radio out, and glovebox open, you will see bottom/left/front of the radio aperture through into the glovebox ( RHD car ). You can poke the wire through here. If its awkward, just tape the end of the aux lead to a piece of stiff wire to feed it through.
Hello,
wanted to clarify one point... For Bravo 2007+ with Blue&Me there is no possibility to install AUX functionality without compromising on Blue&Me features like phone calls and USB media player?