Do these bolt straight to factory mounting points or do I need to cut into the bumper?

They mount at factory locations without modification to the bumper or frame. Test-fit before final tightening to confirm alignment with your specific bumper fitment.

Is the wiring harness pre-assembled, or do I need to splice anything?

The harness is pre-assembled and routes to factory electrical connection points. You'll connect the switch to the dashboard and the lights to their mounting locations — no splicing required.

What if one bulb burns out — are replacements easy to source?

H11 bulbs are standard and available everywhere — any auto parts store stocks them. You can swap a burnt bulb in minutes without removing the entire assembly.