I have a 1961 Mk2 Lotus Seven for which I'm looking for a new or serviceable (ie non leaking) radiator coolant filler pipe. Such a pipe is approximately 15cms long, has a small swirl pot at one end with a pressurised filler cap; a mounting point in the middle; and an outlet at the other end with attached to the car's top radiator hose. Redline Components (the usual stockist) has none available. Can anyone help, please?