Do these use the factory mirror mounting holes?

Yes. These mount at factory points — no drilling or bracket modifications needed. Line them up and bolt them down.

What hardware comes with the mirrors?

The mirrors themselves are included as a pair. Confirm your fastener count before assembly — factory bolt patterns may vary by year.

How stable are these at highway speed while towing?

Manual mirrors are solid by design — no motors or electrical failures. Glass adjustment stays put once you set it. For towing stability, your mirror angle matters more than the mirror type itself.