When I got my roush front bumper, I just bought a relay, a switch, and of course the light bulbs, first wire up the foglights up to your relay and the switch to the relay you know the simple stuff
If you don't know how to wire up a relay don't be ashamed I don't either but there are always diagrams you can follow up on the internet I admit I have to every single time I wire up a relay anyways just do that simple relay hook up and they should work, I put the aftermarket switch where the factory switch goes, if you try to wire it up to the factory wires its a PAIN IN THE ASS man so save yourself 10 hours lol and make sure to also wire up to the ignition wires so the relay has power only when the car is on, good luck and post pics if you do it