Do these extensions require drilling into my rocker panels or bumper?

No. These spats mount to existing factory attachment points. Check that your vehicle's original mounting holes align with the extension holes before final installation — no modification to the body is needed.

What surface prep should I do before painting?

Sand the surface with appropriate automotive-grade sandpaper and wipe clean of all dust before applying your chosen paint or clear coat. This ensures proper adhesion and a smooth final finish.

Are fasteners included, or do I need to source my own?

The extensions ship as bare panels. Verify the fastener type and size required by your vehicle's factory mounting point — your service manual will confirm specifications. Source fasteners rated for automotive body panel use.