ok, take a dremel (easiest way to do this) and look inside the 9005 bulb where the two prongs are. you will see two little plastic guides in between the prongs. those are what keep the 9006 plug from plugging in. so, your gonna have to take the dremel and grind off those two guides... compare it with a 9006 and you'll see what im talking about cause the 9006 only has one guide. once you grind those guides off, clean all the dirt and shit off the bulb and plug it inot the car. If you don't have a dremel you can also use a nail file or a soldering iron, but a dremel is easiest.