Will these lights work with my factory bumper, or do I need to modify it?

These mount at factory bumper points with no cutting or modification needed. Your existing bumper stays intact.

Do these come with bulbs and wiring harnesses?

The lights themselves are included. Confirm your bulb type and harness compatibility before installation — your vehicle may reuse existing wiring.

Can I paint over the smoked finish if I want a different color?

The crystal smoke finish is the shipped condition. If you want a different look, the hard panel surface accepts paint — prep and prime as you would any bumper component.