I think part 9 is a gasket? And I think that the diagram is for a non 164 motor? Maybe a 75?

Right, the water pump has a casting that sits on top of it with an outlet pointing to the right of the cam wheels. On top of that is a sandwich plate with the temperature sensors/senders in it and another casting with an outlet, also pointing right, holding the thermostat.

I suspect that I have these components spare but.... We're moving house in 3 weeks and everything is either packed in storage or still in the garage buried behind stuff packed ready to move. If nobody steps forward I'll probably be able to find it in a month....

Guy