Features Plug-and-play compatible with GMC Sierra HD 2020+ fender lights Dynamic startup sequence with animated effect Fully-illuminated housing, with dual-lens design for an even glow Optional Sequential turn signal feature, with plug-and-play wiring harness OEM-grade construction and perfect fitment Engineered and assembled in USA Overview Upgraded Styling. These LED sidemarkers are a plug-and-play replacement for the factory fender lights, illuminating the entire width of the housing for a distinctive look and brighter appearance. Choose from three lens color options to get the look you're after. Unique Startup. Both the standard and sequential models feature a unique startup sequence. Every time the sidemarkers turn on, they illuminate in an intense amber color starting from the center then spreading to either side. Once they are completely illuminated, they gradually return to a running light mode. Sequencing Turn Signal. Our sequential option provides an upgrade in functionality. Anytime you hit your turn signal, the sidemarkers illuminate in a sequencing amber pattern to indicate signaling! The sequential option uses the included plug-and-play harness to power the fender lights using the headlight connector. Options Amber: These match your original sidemarkers, and are DOT/SAE compliant. Smoked: A dark appearance, great on black and grey vehicles. Clear: These are clear in color, but still have the retroreflector optics. . FeaturesPlug-and-play compatible with GMC Sierra HD 2020+ fender lightsDynamic startup sequence with animated effectFully-illuminated housing with dual-lens design for an even glowOptional Sequential turn signal feature with plug-and-play wiring harnessOEM-grade construction and perfect fitmentEngineered and assembled in USAOverviewUpgraded Styling. These LED sidemarkers are a plug-and-play replacement for the factory fender lights illuminating the entire width of the housing for a distinctive look and brighter appearance. Choose from three lens color options to get the look you're after.Unique Startup. Both the standard and sequential models feature a unique startup sequence. Every time the sidemarkers turn on they illuminate in an intense amber color starting from the center then spreading to either side. Once they are completely illuminated they gradually return to a running light mode.Sequencing Turn Signal. Our sequential option provides an upgrade in functionality. Anytime you hit your turn signal the sidemarkers illuminate in a sequencing amber pattern to indicate signaling! The sequential option uses the included plug-and-play harness to power the fender lights using the headlight connector.OptionsAmber: These match your original sidemarkers and are DOT/SAE compliant.Smoked: A dark appearance great on black and grey vehicles.Clear: These are clear in color but still have the retroreflector optics.. These LED sidemarkers are a plug-and-play replacement for the factory fender lights illuminating the entire width of the housing for a distinctive look and brighter appearance.. Included in the box: Four (4) replacement sidemarkers Ten (10) fender clips . Included in the box: Four (4) replacement sidemarkers . Ten (10) fender clips.. Diode Dynamics 20-21 Sierra 2500/3500 HD LED Sidemarkers Clear Set. Modern LED replacement for your factory sidemarker lamp. Direct replacement for your factory sidemarker lamp.. Plug-and-play installation no modification needed. OEM-grade retroreflector optics. Engineered and assembled in USA. Side Marker Light Assembly. Diode Dynamics - DD5125. Diode Dynamics Lamps. OEM fit-and-finish

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