Hi guys,
if anyone is interested in buying the OEM Alpine upgrade kit, you can get it on this website. You would, however, have to do the installation yourself + get the new door trims at your BMW dealer.
http://www.salesafter.eu/product_inf...m-alpine.html&
It also states the same info about the radio professional, sadly..
"
Fits not for cars with navigation business (SA606), navigation professional (SA609), radio professional (SA663), BMW HiFi-system (SA676), BMW HiFi-system professional dsp (SA677) or harman kardon HiFi sourround system (SA674) !!!"