this is what I bought.
http://www.amazon.com/Original-GRIFF.../dp/B00504T3P4
works great! although i do not have iDrive.
my phone connects to this to stream music and the car for phone calls.
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2007 328xi Wagon, Black Sapphire Metallic, Sports Package, Cold Weather Package, Rear PDC, Airlift kit with 3P mgmt, CF Akrym rep lip, LCI M-Tech front bumper, LUX Angel Eyes, Black Kidneys, LED Interior Lights, M3 Steering Wheel with Extended Billet DCT Paddles, 19" Staggered VMR 710's