How about
http://www.painlesswiring.com/connectr.htm
If not, how about tapping the existing wires so that you have two connectors running out of your car's fog wiring. I.e., get a new pair of male-female connectors, splice the male onto the OEM wiring such that you have two connectors coming out of the OEM wiring. One is the OEM connector for the OEM fogs, and another is the new one you spliced onto. Install the female on the new light.
You can just cover the dangling OEM connector with tape.