Do these bolt straight to factory mounting points, or do I need to drill new holes?

They mount at factory rocker points — no drilling needed. Test-fit before final fastening to confirm alignment with your body line.

How does the manual-extend function work?

A lever or rod mechanism lets you push the mirror arm outward when towing, then retract it. Activation is mechanical — no power function for extension, just heated glass and mirror adjustment.

Will the heated glass work in deep cold, or just light frost?

Heat function is tied to your vehicle's electrical system. Refer to your truck's owner manual for heater cycle timing and temperature thresholds — performance varies by ambient and engine running time.