Do these mount to factory mirror points?

Yes, these mount at the factory mirror locations—no drilling or adapter brackets required. Install directly where your OEM mirrors bolt up.

Will they stay put at highway speed?

Manual mirrors are mechanically locked once you set your angle—they don't drift or vibrate loose under normal driving conditions. Just dial in your sight line before you haul and you're set.

What hardware comes with them?

Mounting hardware is not specified—verify your factory bolt pattern and fastener size before installation to avoid delays on the job.