Hi,
Maybe I can help you, if you have the Bav 37 /2 CR out of 2006.
Tomorrow and the following weekend, I am on the boat and can measure it.
But there is one problem, my english is not god enough to understand which part you are looking vor.
Can you give me a picture or describe where I could find the "guardrail wire"
Ok I just google it. it is the wire to avoid falling man over board. So what do you want to know exactly? Only the diameter of the upper guardrail wire? With ore without the whit hull?
regards