PSU cable extensions (sleeved)?

[Nichrome]

Hi

Sadly, it is quite expensive for me to buy a whole kit of sleeved modular cables for my SF Leadex 850W Platinum. So thought of cheaper alternative to ne the extensions cables.
I found on OCersUK some extension cables that are sleeved. Would like to use 2x6+2 pcie and 24 pin for mobo power. Is it any good to use such extensions, or can it cause some power delivery interference?
Currently dont have any coil whine, but in doubt if using such would cause it to occur?

Thanks.

 

[Nichrome]

Yeah that is what I also thought of, is that they are rather universal.
Thanks

 

[Nichrome]

Just one more question:
what comb size do these Silverstone extensions use? Would like to get for:
24 pin, 6+2 pin PCIe and 6 pin PCIe.