Did you get anywhere with this?
I too am looking for the correct part.
Unfortunately I have still been unable to find the original part. I have bought the following parts that have allowed me to complete the setup but will not know if they are any good until the engine is in a car..
As you can see this has now been fitted at a 90 deg angle. This should allow all hose connections to be tidy when done. This does incorporate a non return valve. I have no idea on original as to spring rate for pressure so just got a non return and will see if it works.