Do these mount at the factory mirror points, or do I need to drill new holes?

These use factory mounting points — no drilling required. Test-fit before final fastening to confirm alignment with your door panel trim.

Will the heating element work if I only want power adjustment without the heat?

The heating function is wired as part of the main power circuit. You can control it through the OEM switch on your dash. There's no separate on/off for heat alone — it operates when you engage the heated mirror function.

Are the LED turn signals connected to my existing turn signal relay, or do they need a separate module?

The wiring harness taps into your OEM turn signal circuit. The LED signals draw less current than incandescent bulbs — verify your existing flasher relay handles LED load, or upgrade to an LED-compatible flasher if the signals hyperflash.