See sources and related links below for headlight lamp part number information.
H007
Low Beam Headlight Bulb Size: 9006High Beam Headlamp Light Bulb Size: 9005
you don't need a bulb
The 2006 GMC Yukon has a V8 engine.
The 2006 GMC Yukon has a 4.8 L base engine size.
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9007 for your headlight
According to the owner's manual - headlight bulb # 9007
The 2006 GMC Yukon-XL has a 5.3 L base engine size.
The 2006 GMC Yukon-XL has a V8 engine.
H13 for the Headlight and H11 for foglight.
9004