shi_daniel Posted January 7, 2016 Share Posted January 7, 2016 Hi, The base of the bulb is completely different. You cannot install an H11 bulb into a 9006 socket as the bulb won't twist into place. Thank you for the clarification. Steve Thanks for helping me! I just don't know why there is HB4 to H11 wire adapter without a socket adapter. If a HB4 bulb can not be used in a H11 socket type (with a socket adapter), I see no reason to buy a HB4 to H11 wire adapter. Edit: You'll have to use a HB4 to H11 wire adapter if you had a HB4 stock fog light and switch to H11 projector fog light and don't want to cut into your stock harness. However, I see no reason to go on with this change. Link to comment Share on other sites More sharing options...
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