Will these work with my factory wiring, or do I need to run new harness?

The harness comes with the kit, so you're not pulling factory wires. Splice into power at your fuse panel or under-dash and run to the included switch—pretty straightforward stuff.

Do I need to paint these before installation?

Smoke lens is finished as-is. The housings are hard panel construction—no primer or paint required before mounting.

Are these a direct swap into the factory fog light holes?

Yes. These mount at factory points with zero drilling or bracket fabrication. Test-fit before final wiring to confirm your specific model year seats them flush.