radio head unit

I have given up trying to find a CD changer to fit my 2002 156. I am just
going to get a new radio mp3 CD head unit instead! According to halfords and
other online retailers, the car will accept any after marker radio, but I
have the Bose speaker kit with subwoofer and I just want to make sure
everything will still work. I'm sure some of you have replaced the original
Blaupunkt head unit. Any trouble? I know I will need a facia adapter, but I
can live without that to start with.

I have found a nice silver JVC KD-G411 mp3 cd head unit which is steering
remote ready, but where can I find a wiring adapter for the steering
controls?