Oh yes I see what you mean now! I will check if I have some black sata heatshrink left if not I will have some in my next order which will be pretty soon :biggrin:WARNING: HORRIBLE PICTURE INCOMING.
But something like this. That is SATA sized heatshrink used here. You would need to remove the 6-pin connector to get it over. Or you could use the larger heatshrink (which you can see on my 24-pin in previos photos) go over two 6-pin (or even all four) cables at the same time.
I will post some pics when it will be done...It's gonna give a cleaner almost straight look at the PCIe cables...thanks for the hint!