Do these come with bulbs or do I need to source them separately?

These are LED light bar units — the LED elements are integrated into the assembly. No separate bulbs to buy.

What's involved to swap these in?

Tail light replacement is straightforward — access from inside the trunk or rear panel, unplug the old assembly, swap in the new one, and reconnect. No special tools needed for a standard swap.

Will these work with my factory wiring harness?

These are designed as direct-fit replacements for your vehicle's factory tail light sockets. Plug-and-play fitment — no rewiring required.