Holley H820 RetroBright adapters are a simple plug-and-play solution if you don't want to mess with ripping up your stock wiring or swapping pins on your headlight connectors. These harnesses will make the job quick and easy if the H4 male plug used on Holley RetroBright Headlights will not fit your female socket or if you need to shift pins around to match up properly.

Note: When wanting all four lights illuminated on 4-headlight systems use Holley H810 H4 quad low/high splitter (sold separately)