Do these mount at the factory rocker panel, or do I need to drill?

These use factory mounting points on the extended cab rocker — no drilling required. You'll bolt them directly to existing hard points on your truck's frame.

Will these bars need paint or primer before I install them?

Test-fit them first to confirm they sit flush and align properly. If you're keeping them as-is, wipe down with a degreaser before bolting on. If you want to paint or powdercoat, do that before installation and let cure fully.

What hardware do I need to bolt these on?

The bars come as assembled pairs ready to mount. You'll need to confirm your truck's OEM rocker bolt size and type — check your service manual or contact your dealer for the exact fastener spec before you order separate hardware.