Does this come with the bulb, or do I need to source one separately?

The LED assembly is integrated into the light unit — no separate bulb purchase needed. It's ready to wire and mount.

Does this mount at the factory location, or will I need to drill new holes?

Mounts at the factory center-mounted brake light position using existing attachment points. No drilling required.

What do I need to do before installation — does this need paint or any prep?

The red lens is pre-finished and ready to install as-is. No painting or surface prep needed before mounting.