Do these mount directly to my factory mirrors without drilling or brackets?

These are designed for factory mounting points on OEM towing mirrors. Test-fit before committing to final installation method to confirm fitment with your specific mirror assembly.

Will these side lights stay stable and visible at highway speeds?

LED side lights are engineered for static mounting on mirror housings. They're designed for visibility and durability at normal driving speeds. Mount securely per the factory anchor points to avoid vibration or rattle.

Are bulbs or wiring harnesses included, or do I need to source those separately?

The assemblies ship as light units. Confirm your mirror's existing electrical connection before purchase—you may need to adapt or extend wiring depending on your truck's current setup.