Not sure if it's already known or if this type of thing has been covered before but as I plan to change the audio set up in my vectra at some point, I thought this site might be useful! Stalk Adaptors&section=Car Audio

I'd be intersted to know of any other places where stereo adaptors and patch leads are available so I can work out what would do the best job of upgrading the head unit without compromising the remote buttons, BC stalk, display etc.