Do these bolt straight onto the factory headlight brackets?

Yes — they mount at factory rocker points with no drilling or bracket modification needed. You're swapping the assembly in and out.

Do the LED bulbs come installed, or do I need to source them separately?

The LED arrays are part of the assembly. Install the headlights at the factory mounting locations, wire the connectors to your truck's harness, and they're live.

Will these require a ballast or relay kit to run?

No additional ballast or relay hardware is needed. The LED circuits are self-contained in the housings and integrate directly with your existing electrical system.