If you need to fit a after market radio head unit with Bluetooth phone and phone connection with Aux port ie USB and also want to play mp3 cd in your x300 with your existing Jaguar sound system Harman Kardon Amp you will need one of these interfaces that are available in 2 options with or without steering wheel controls and will also connect using original jaguar radio harness without the need to cut the original wiring harness.
Please email Mani at mani.gill379@gmail.com or you can call me on 07960644546.
These are a very easy to install simple plug and play interface. Just installed in to my jaguar x300 and works really well with the factory fitted sound system. You will not be disappointed!