I have 50 of the 18 pins cables custom made in stock, and also some 16 pins ones for early S5s.
12" long, they were like 1$ each. if I remember correctly.
There are/were for the S5 watercooled case, and some other projects, but it seems that they can serve other purposes.
Edit on availability and pictures


I would also like to buy some of your 18 pin cables if you would be so kind to send it to the Netherlands?
I'm not in a hurry ,as you still have to order them. 10 cables would be nice.
Hope to hear from you.