I'm planning to take my refurbished 2 litre engine down to France when we visit in April, and as I'll be using Ian's (squiglyzigly) thermostat and housing mod, I need to know the top radiator inlet boss o.d. size so I can (if needed) order up the correct size of silicone hose. I've learned from bitter experience that trying to get non-standard parts for a 45+ year old car in France is like trying to find unicorn droppings. It's the o.d. of the top inlet boss on the LH side of the radiator as you sit in the car that I need.
Thanks in advance, Graham