no need to,
if your talking about your enermax psu which I'm unsure if it's modular then take a look here
Computer hardware and software at amazing prices, available online from Scan Computers UK
As for Coolermaster ones
Tolon I think you'll like this
Cooler Master Parts Shop
Theres the 8 pin connectors there and it's £3.50 each and £3 postage.
I know it's rude to post other shop's links but Scan don't sell Coolermaster ones so it's just helping out. Would be nice if they did start selling it though
But if you guys are talking/seconding a PCI-E 6 Pin to 8 Pin Converter then I'm not sure if that would work.