Will this LED light work with my factory wiring?

Yes. This assembly connects to your existing third brake light harness without modification. LED draw is actually lighter than OEM, so no rewiring needed.

Is there any prep work before installation?

Remove the old light and clean the mounting area of any debris. The new assembly mounts at factory points, so no drilling or custom brackets are required.

What if the light doesn't seat flush against the panel?

Test-fit first to confirm alignment with your mounting points. If gaps appear, verify all fasteners are seated fully and hardware is tight before closing the panel.