Car AUX Adapter Cable Bluetooth +MIC Fit for Peugeot 307 308 407 RD4 Radio CD - AliExpress
EBTOOLS Bluetooth Aux Audio Adapter Autoradio RD4 Stereo Aux-IN Audio Kabel Adapter Ersatz für Citroen C2 C3 C4 C5 C6 C8 für Peugeot 207 307 308 407 607 807 1007 4007 : Amazon.de: Elektronik & Foto
Bluetooth Adapter Audio Aux Cable Compatible with Peugeot 207 307 407 308 : Electronics - Amazon.com
Peugeot 407 RD4 how to install aux cable - YouTube
Peugeot Citroen RD4 RT3 Can-Bus Bluetooth Adapter, Digital Car Stereo Aux Interface with USB Charging Cable 3.5mm Audio Input Port for Peugeot 2004 + Citroen 2005+: Amazon.de: Electronics & Photo
Install Android Multimedia Unit on Peugeot 407 - YouTube