Do these mirrors use factory mounting holes or require drilling?

These mount at factory attachment points — no drilling needed. Bolt directly to existing holes on your truck.

What wiring do I need to run for power and heat?

You'll need to tap into your vehicle's electrical system for mirror power and heating circuits. Consult your truck's service manual or a professional installer for proper routing and breaker specifications.

Do the LED turn signals integrate with my factory signal flasher?

The LED housings are built to work with standard turn signal circuits, but compatibility depends on your truck's existing flasher module. A relay upgrade may be necessary — verify with your vehicle's electrical diagram before installation.