OK I finally have my answers, it was long to find on the web, but BMW did not help me at all, I guess I will have to inform them about their own products !
So here are all the models and references of iPhone snap-in. They are from the BMW catalog, but references are the same for Mini :
For vehicles without link or Music Player in mobile section :
- Snap-in adapter, Basic for IPHONE 2G ref 84109182792
- Snap-in adapter, Basic for IPHONE 4 ref 84212199389
- Snap-in adapter, Basic for IPHONE 3G/3GS ref 84212158682
This one only charge the iPhone, no music control, but you have the benefit of the external car antenna for your calls (need bluetooth option for calls), for old Mini models I guess.
For vehicles with link, Music Player in mobile section but without Combox :
- Snap-in adapter, Music for IPHONE 4 ref 84212199390
- Snap-in adapter, Music for IPHONE 3G/3GS ref 84212158683
- Snap-in adapter, Music for IPHONE 2G ref 84109164213
- Snap-in adapter, Music for IPOD TOUCH ref 84212162534
This one is for Mini prior to 2011 with music controled. There seems to exist 2 versions of each reference, first is standard, second has a built in ventilator because the iPhone becomes hot. Refs are -01 or -02, ex. iPhone 4 model with ventilator is 84212199390-02.
For vehicles with link, Music Player in mobile section, Combox and BMW Apps :
- Snap-in adapter for media for IPHONE 4 ref 84212218390
- Snap-in adapter for media for IPHONE 3G/3GS ref 84212218391
This one is for 2011 Mini with Connected system.
For vehicles with link, Music Player in mobile section, Combox but without BMW Apps :
- Snap-in adapter for media for IPHONE 4 ref 84212199392
- Snap-in adapter for media for IPHONE 3G/3GS ref 84219229004
Not sure, maybe new 2011 models without the Connected option.
All models of iPhone and all references of Mini are covered, so don't let your dealer tell you it doesn't exist or give you the wrong adapter because he don't know its products
EDIT : I renamed the thread