Oh i see,so you only got 1 6 pin,the image wasn't quiet clear so that will limit your options alot.
Hmmm
Any chance you can find another 6 pin connector? Like maybe attached to your graphic card?
You could always buy a molex cable so that you can attach it to your 6 pin connector to make it to two.Can you find the model of your powersupply unit.Like is it from corsair,seasonic then xfx,cw,vs 500w/600w etc etc Like what's written on the box you bought the power supply with.
For eg-
Cooler Master GX-II 550W
This is a power supply model from cooler master
can you find out yours?