Yeah I was gonna suggest Kustom, I bought one for around £6 way back that turned out to be a psu-mobo extension. They sent me the right one foc, so now have both
I didn`t find any1 else tbh.
EDIT: hang on a sec I might have that wrong. I was looking for 6pin to 8pin, so I might have the 8pin-8pin... I`ll check when I get home. It's urs foc if it's the right one.