Do these bolt to factory mounting points or do I need to drill?

They mount at the factory rocker attachment points—no drilling required. Use the existing holes on your truck.

What hardware do I need to install them?

Mounting hardware is not confirmed with this product. Bring your bars to a shop or verify fastener size and grade against your truck's service manual before purchase.

Can I repaint the black finish or does it need stripping first?

The powder coat is already applied and ready to use. If you want to repaint, light scuff sanding will help adhesion, but stripping is your call based on your finish preference.