I have made these tunnel lines up........
from the same 3011 Polyamid tube used by Porsche. The difference is my tunnel lines have threaded fittings at each end, and allow use of replacement hoses front or rear, making it much easier to repair or fit a front fuel pump with a custom hose.
So far, I am only able to buy M16 fittings for this 10mm Polyamid tube. It is the appropriate size for this tube, and correct for a 3.6 upgrade when Porsche used M16 throughout. However, for the earlier models Porsche used a 10mm tunnel line with a custom 14mm fitting, and on the 3.2 & smaller motor used a combination of M14 & M16 fittings.
I would be happy to supply any combination of lines & crimped hoses you may need, or sell you just fittings if they will help.
Len at autosportengineering dot com
Please, no PMs. Its almost always full and I cannot send photos via PM.
Len