I'm not sure why I'm having so much pain replacing a simple bulb. I initially wanted brighter/whiter bulbs, so I ordered a pair of 9006 LED's, well they do not fit back of the housing, thought it was just bad fitment, I orders two more pairs from different aftermarket brands, not luck. Then I finally resorted to Sylvania Silver Star Ultra halogens, still won't fit!! I can't believe it, I thought I had them before. What's going on? I currently have Phillips 9006 on and it fits right in with a simple twist. Is there something else I need to make sure it's a match other than 9006? Please advise.