Do these come with bulbs already installed?

Yes. The LED units arrive fully assembled and ready to plug in—no separate bulb purchase needed.

Will these work with my factory wiring harness?

Test-fit first. These mount at the factory side marker locations, but harness compatibility depends on your specific connector type. Bring photos to a BMW forum or tech if you're unsure about the plug match.

Do I need to remove the bumper to install these?

Typically no—the marker lights sit in cavities accessible from inside the bumper or with minimal trim removal. Check your service manual or a model-specific guide before starting.