Do these connect to the factory wiring harness?

Yes. These are designed for direct integration into your existing front marker light circuit. No new harness required — splice into the original side marker wires and you're done.

Will these fit if my bumper has sensor holes?

These mount at the factory side marker location on the bumper itself, not in the lower valance. If your bumper has PDC sensor cutouts elsewhere, they won't interfere with installation.

Do I need to paint these before install?

The lens is crystal clear — no paint needed there. The back housing is bare, so you can match it to your bumper color before final fitment if desired.