Great bit of info on the optional setup for the SWB, where did you find that, its not in my parts book but then again neither is the heater, looks like you have exactly the right setup.
Front side of servo has adjustment on the pin that pushes against master cylinder piston. May not need adjustment was just letting you know the option was there.
Citizen Cane do a web search for Smithies landrover will bring up a NZ site which has lots of good info including optional parts catalogue in four pdf's