Probably something you would want to contact the manufacturer about. I've never seen that type of cable before either.http://www.fspgroupusa.com/support_center.html
For anyone that comes across this post. The cable is called a C19 Female. It isn't very common and is used with commercial computer systems. Apparently people are starting to use them with the higher powered PSU's.
Very hard to find in store though so I would recommend staying away from them at least until they become more common.