BMW Auxiliary AUX Input Adapter Kit - Behind radio. - armour
Amazon.com: BMW AUX Adaptor Cable Mounting Kit | Car Stereo Mountable Socket 3.5mm AUX Female Connector + 3.5mm Aux Male Cable 1m for BMW X3 (2004-2010)/ BMW Mini Cooper (2002-2006) / Mini Cooper S (2005) : Electronics
BMW Auxiliary Port Installation - E60 5 Series All Models
BMW AUX Input Installation - With Navigation - Xoutpost.com