2g combox is fine. 4g are pretty hard to find used. Your tcu and mulf are facing opposite directions but it probably will fit if you get creative. The MULF power/aux wiring (big blue connector) is facing rearward and the USB is going forward. The TCU BT antenna is facing rearward and the power/mic (big white connector) is facing forward. Combox will have the BT antenna and USB on one end and power/aux in/mic in (and most fiber) on the other.

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2009 35d, 2006 325i & 330i