Connects2 CT20AU01 - Audi Car Stereo Radio ISO Harness Adaptor Wiring Cable Lead This adapter is required when replacing your factory fitted radio with an aftermarket radio. It will convert the original vehicle power & speaker wiring connectors to a standard ISO connector. Simply plug one end of the adapter into your cars wiring harness and the other into your new radio. Manufacturer Model Note Year From Year To Headunit Connection Audi A2 2005 2005 Quadlock (Fakra) Audi A3 2005 2012 Quadlock (Fakra) Audi A4 2005 2015 Quadlock (Fakra) Audi A6 2004 2011 Quadlock (Fakra) Audi TT 2006 2014 Quadlock (Fakra) VW Beetle 2011 2015 N//A Disclaimer: Please check the plugs and connections in our picture matches the plugs and connections in your vehicle before you make your purchase. If unsure please message us via [email protected] with pictures of the plugs and connections so we can advise further.