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it uses a 9003 lamp. not sure if that crosses to an H4 or not. i have been running the regular silverstars for a while. the ultra was not available when i bought the silverstars.
 

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HafNHaf said:
it uses a 9003 lamp. not sure if that crosses to an H4 or not.
H4: European / Japanese spec
9003: US spec
They're basically interchangeable, the main difference is in the lamp reflector that they go into: Europe: asymmetric light that illuminates road edges without blinding oncoming vehicles, US: symmetric light that blinds oncoming drivers without illuminating the edges.
 
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