Grom Audio USB2 Plus - USB Audio Player ($85/obo) | BMW M5 Forum and M6 Forums
GROM Audio VAGSU3 (GROM-USB3-VAGS) - Android and iOS Smartphone Integration for Select 1998-2010 Seat, Skoda and VW Vehicles with Single DIN Radio - Walmart.com
Installation of GROM USB Android iPhone Bluetooth Car Kit Into BMW Z4 2003-2008 (trunk) - YouTube
GROM Audio MITS08N2 USB and Android Car Adapter for Mitsubishi Citroen Peugeot at Lowes.com
Amazon.com: GROM USB Streaming Car Adapter Kit Compatible with Select Stereos in BMW Mini Rover 98-06 and iPhone Smartphones, and USB Flash Drive, Bluetooth AUX Capable - BMWTU3 (Trunk Install) : Electronics
FS: E39 GROM USB Audio Kit BMWTU3 | BMW M5 Forum and M6 Forums
GROM Audio USB MP3 connection kit for BMW, replace CD changer with USB stick CDC | eBay