Fog lights no fog, no difference. Most of these old focus actually have the wiring for fog lights anyway. You can look under the car behind the bumper, mine were tied up to the rad support. Not 100% sure about SVT, but I can't image they would change the switch, the car are basically the same in that respect.
Somewhere there's a DC10 struggling to get off the ground. I'm not a fan of wings on street cars, I like low key spoilers, but not something that you have to custom order from Boeing.