oil siphon tube question

[turniprash]

Hi all, I'm working on my 1955 KHK, it has an early production left side case using a siphon tube assembly.
I have the oil siphon screw and the breather valve or "flutter valve" but do not have the siphon tube.
I'm thinking I can fabricate a new tube but need some specs about the tube to make one.
Would appreciate some measurements if anyone can help??
Thanks Joe