Apparently BMW has very recently introduced a new Bluetooth SAP (SIM-Access-Profile) Universal Snap-In Adapter. P/N 84-21-2-158-363
It is for vehicles with SA 609 (On Board Navigation System) and SA 633 (Bluetooth Mobile Phone Preparation Business) / SA 644 (Bluetooth Mobile Phone Preparation) starting from 09/2008.
It's not on realoem or getbmwparts yet. However you can get it from Roveractive (item # 170374175056):
BMW Genuine Bluetooth SAP Universal Snap In Adapter : eBay Motors (item 170374175056 end time Mar-18-10 11:37:34 PDT)
According to BMW it
is compatible with:
1 Series (E81, E82, E87, E88)
3 Series (E90, E91, E92, E93)
5 Series (E60, E61)
5 Series GT (F07)
6 Series (E63, E64)
7 Series (F01, F02)
X1 (E84)
X5 (E70)
X6 (E71Z4 (E89)
And it
is NOT compatible with:
3 Series (E46)
7 Series (E65, E66)
X3 (E83)
X5 (E53)
Z4 (E85, E86)