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If you own a 2004 GMC Sierra, you have likely noticed the telltale signs of aging headlights: hazy, yellowed lenses that scatter light rather than projecting it clearly down the road. While polishing kits offer a temporary fix, replacing the entire 2004 GMC Sierra headlight assembly with a new, DOT-certified unit is the only way to restore factory-fresh performance and safety. This guide explains what DOT certification means, why it matters, and how to choose the right assembly for your GMT800 truck.


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