I use to have hids in my 08 fusion se but to have since then taken them out. They are a pain to get right because of the smart control junction box. The way that mine were set up was with chancellors to avoid a bulb out warning. And in the headlights you have to use a 55 watt kit. The fog lights you can use a 35 watt kit with out cancellors. You do not need a relay harnesses. I wouldn't advice putting them in your high beams because some kits can take up to 30 seconds to fully heat up which really defeats the proper use of your high beams unless your driving down a dark road where there is no one around. So in short for the low beams use a 55 watt kit with chancellors and in the fog lights just use a 35 watt kit or 55 watt kit(more expensive)