Do these use the factory wiring, or do I need to rewire them?

They plug directly into your stock harness. No rewiring or splicing required — same electrical connection as the originals.

Will these fit without any trimming or grinding?

Yes. They mount at factory points with no modification. Test-fit before final installation to confirm fitment on your specific vehicle.

Can I paint the housing or just use them as-is?

Use them as-is. The crystal clear lens is the finished product — no painting or prep work needed before installation.