There are two fitted on the car. 

This unit is an aftermarket alternative to the original Bentley auto ride diagnostic tool (UD73741) and comes complete with its connection lead. It's simple to operate and enables you to switch the suspension dampers between the different modes: normal, comfort and speed. The tool clearly shows any faults in plain text rather than just numeric codes. It also allows you to reset fault codes and calibrate the ECU. While driving, it displays the current vehicle speed and active ride mode, making it a very practical and user-friendly diagnostic device.

This unit is an aftermarket alternative to the original Bentley auto ride diagnostic tool (UD73741) and comes complete with its connection lead. It's simple to operate and enables you to switch the suspension dampers between the different modes: normal, comfort and speed. The tool clearly shows any faults in plain text rather than just numeric codes. It also allows you to reset fault codes and calibrate the ECU. While driving, it displays the current vehicle speed and active ride mode, making it a very practical and user-friendly diagnostic device.

Alternator - With built in regulator
This new alternator assembly is a direct replacement for both the 55A and 75A units.