Do these mount at the factory cab light locations?

Yes. These bolt directly to the factory mounting points on the Ram bed — no drilling or additional fabrication required. Test-fit before final fastening to confirm alignment.

Will I need to splice into the existing wiring or run new harness?

Connection method isn't specified — confirm your vehicle's cab light wiring before ordering. You may be able to use the factory harness or need to run dedicated wires depending on your truck's setup.

Do the housings need to be painted or sealed?

Chrome housings arrive ready to install. No painting necessary. Inspect the seal around the lens before mounting to ensure water doesn't pool inside the bed.