Will this bolt straight to my factory mounting points?

Yes. This mounts at the same factory attachment points as the OEM third brake light. No modification to the truck bed or cab is needed.

Do I need to splice wires or tap into the factory harness?

The harness connection method isn't specified. Have an electrician or experienced DIYer verify compatibility with your truck's wiring before installation.

Does the finish need prep or sealing before install?

The black/smoke finish is ready to mount out of the box. Once installed, standard automotive sealant at seams keeps moisture out.