FWIW,
Fabricator and myself use braided VW fuel line. The stuff they used on the air cooled motors, I think it's 5 or 5.5mm. It fits so well that there is no need for clamps, and the only ways to get it off is to cut it or dab a little gas on the outside and it will release. We get our line from a local VW resto shop.
That sounds good, can you post a pic?
Yeah sure no problem. I have my CL350 here, and I used the same line on it too. I'll post em tomorrow.