Well... I'm sure your not the first person to do that.
I would say to go and ask Thermal Take for some replacement cables, or track down someone who owns another same PSU and see if you can get it cheap, and just use the cables. Normally cables between different power supplies aren't interchangeable, unless they are from the same series (Ie, the AX750 cables are compatible with the AX850 and AX1000).