Alex
I am not sure of the part number but there will be several which fit , and each will have a different opening temperature.
Morgans used to fit a 85 Deg C unit , until emissions regulations forced them to run the Rover V8 hotter , at which point I think it went to 92 Deg C, but there are probably other temperatures in addition. The exact opening temperature is not critical in a Morgan application.
My temperature sensor (on a 1999 car) is at the bottom of the radiator, but the location does change from year to year.
