Do these mount to factory holes or do I need to drill?

They use existing factory rocker panel attachment points — no drilling into the frame. Test-fit before final tightening to confirm alignment with your specific truck.

Will I need fasteners or brackets that aren't included?

Fastener hardware is not confirmed in this listing. Before ordering, verify what mounting hardware your truck already has at the rocker points, or reach out to confirm what you'll need to source separately.

Can I repaint these or do I need to prep the surface?

The powder-coat finish is ready to mount as-is. If you want a different color, light scuffing with fine-grit sandpaper will help new paint adhere — refer to your paint manufacturer's prep guidelines.