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The Diode Dynamics sequential sidemarker set replaces GMC Sierra HD 2020+ fender lamps with a fully illuminated LED housing and animated startup sequence. When equipped, the sequential turn signal provides an amber sequencing effect using the included harness for plug-and-play installation. Options include DOT/SAE-compliant amber, smoked, or clear lenses for tailored styling while maintaining OEM fitment and retroreflector optics.
Diode Dynamics 20-21 Sierra 2500/3500 HD LED Sequential Sidemarkers - Amber Set
