Do these use factory mounting points or require drilling?

These mount at the factory mirror attachment points — no drilling required. Check your existing mirror hardware before installation to confirm compatibility with your current setup.

Will the white LED be bright enough to meet visibility standards?

LED output is significantly brighter than the original incandescent bulbs. If your vehicle requires DOT or SAE compliance for side markers, verify local regulations before installation.

Are the wiring harnesses included, or do I need to source connectors separately?

Harness configuration is not specified. Test-fit the assembly to your factory mirror connectors before committing to installation — you may need adapters depending on your mirror's electrical setup.