The Lotus 4 channel ABS actuator is part number 2 on the below diagram.

Item Qty Part Number Description Notes
01 1 A120J6000F ABS Control Module
02 1 A120J6004S ECU Kit, ABS actuator
03 1 A116M0091S HCU Kit, ABS actuator
In reality this is what the part looks like
Additionally the part number (found on the bottom of the unit) is NOT the reference as above, it is instead S108196012


New ABS unit
Fitting the unit was pretty simple. Remove the connector from the unit by sliding the clip sideways
Undo the four torx head screws and remove the computer unit from the hydraulic unit.
After that simply install the new computer with new rubber seals by reversing the procedure
here's the original 2 channel unit part number