The Servo ABS 3 consists of two units.
The Motor Pump unit
and
The Electronic Control Unit.
Be careful, and make sure you get what you want because the less knowledgeable may not know that ABS 3 units fitted to the R1150 range are not all the same. The R1150RT and RS units have front and rear brake controls linked, where as the others only have front brake control linked. This will probably not matter, if all you want is to fit an ECU and not connect it to an existing Motor Pump Unit.