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Registered
Join Date: Apr 2007
Location: Hudson Valley, New York
Posts: 4,263
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H4 is a bulb type, and there are scores of headlights that take this bulb. I think people get confused because Porsche people are almost always referring to the Euro H4 assembly when they say "H4," but before those were popular, people were installing 7-inch round H4 lenses in their factory light assemblies. - Matt
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