7l74-13c170-aa Is the part number ford gave me, they were wrong about telling me the car took a d1s bulb because when i pulled it out , it was a d3r bulb. Not really sure what the ballast part number actually is but that's the part number ford gave me. Does anybody know if the part number for the ballast or if the newer ballasts will fit and work for my car? What's the difference between the d1s and d3r bulbs? Color? But will all these different d bulbs work? Then damn light bulb alone is 100$ for a sylvania which is what the car was supposed to come with says this kid who works the parts counter at ford. I bought it, but my bulbs that eee currently in there were d3r bulbs. Not d1s. So which ballasts can I go with? Will the newer models even the 2016 eco boost and gt's have the same ballasts or one that will work? They look like they will work. Or should I just spent the 120$ and buy two aftermarket bulbs and ballasts and have immediate gratification so my car had headlights, and then return the bulb I bought and sell the oem ballast that works and the two oem bulbs?? right now I only one works because my drivers side ballast is out. Thank you.