Will this bolt directly onto my truck without drilling or brackets?

Yes, it mounts at factory rocker and body points — no modification needed. Align and bolt down with your existing fastener holes.

Do I need to source fasteners separately?

Hardware is not included with the mirror assembly. You'll need the original bolts from your truck or equivalent metric fasteners; verify size and thread pitch against your vehicle's service manual.

Can I adjust the mirror glass if it's loose or cracked?

The mirror glass itself is not separately adjustable in this assembly — it's integrated into the panel. If the glass is damaged, the entire mirror will need replacement.