I have a 91 foxbody with one piece headlights. I purchased the car as is, and i don't know what brand the lights are, and I can't find them for sale online. They look fairly new too. Anyways, I purchased the 9004 bulbs but they will not sit in my headlight housing. The bulb connects to the factory wiring harness just fine though. My headlights are not the L.E.D. kit either.