Do these bolt straight to the factory towing mirror arms?

Yes. These use factory mounting points on the mirror assembly — no drilling or fabrication needed. Bolt straight on with basic hand tools.

Will these lights work with my existing wiring harness?

Verify your factory side marker wiring before install. These are designed as direct replacements for the stock marker lights, but harness compatibility depends on your specific truck's electrical setup. Test-fit and wire before committing to permanent mounting.

Are the bulbs and wiring included?

The assemblies come complete. Confirm all components are present before installation — if any wiring or connectors are missing, contact support before mounting.