Will this plug directly into my existing wiring, or do I need an adapter?

It uses OEM connectors, so it connects straight to your factory harness with no adapters needed. Make sure your vehicle has the powered mirror option from the factory—non-powered models won't have the wiring routed to the door.

Do I need to remove the door panel to install this?

Yes. You'll need to pop off the door panel to access the mirror mounting bracket and connector. It's a straightforward swap once you're in—most people finish it in under 30 minutes with basic hand tools.

The mirror is used—what's the condition of the heating element?

Heating functionality is not guaranteed on used mirrors. Test it on the bench before final install if possible, or confirm operation immediately after mounting so you can swap it out without fully reassembling the door panel.