Will these plug directly into my factory wiring harness?

Yes, these mount at factory locations and connect to existing cab light circuits. No wiring modification needed for direct installation.

Do I need to remove the roof panel to install these?

Installation process depends on your specific roof configuration. Test-fit before committing to final mounting to confirm clearance and attachment method.

What happens if a bulb burns out?

LED elements are integrated into the housing assembly. Replacement would require swapping the entire light unit rather than just the bulb.