Do I need to buy a bulb separately?

The assembly itself ships without a bulb, so you'll need a compatible halogen bulb. Grab the right spec for your vehicle and swap it in when the unit arrives.

Will this bolt up to my existing wiring harness?

Yes. Factory mounting points and connector design mean your current harness plugs straight in with no rewiring or adapter needed.

Do I need to remove the bumper to install this?

Access varies by trim and condition. Most installations reach the headlight from the engine bay without bumper removal, but check your service manual or test-fit first to confirm your specific setup.