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1. The bulb itself will have markings on it. One of the markings will give you the industry number for the bulb type. This bulb shows that it is an 9004/HB1 type bulb.
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2. If the bulb is from a headlamp, the bulb type is usually printed or molded into the lens. This lamp takes HB3 and HB4 type bulbs.
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3. If you are looking for the bulb type on an OEM lamp, the information should be printed in the Owner's Manual.
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Headlight Bulb Cross Reference
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An H4 bulb is also referred to as a 9003 or an HB2
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A 9004 bulb is also referred to as an HB1
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A 9005 bulb is also referred to as an HB3
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A 9006 bulb is also referred to as an HB4
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A 9007 bulb is also referred to as an HB5
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H.I.D. bulbs are referred to as D1S, D2R, and D2S
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H1, H2, H3, and H7 bulbs are usually referred to as such