Do these require bulb replacement or do they come with bulbs?

Bulb configuration not specified — verify bulb type for your model before ordering. You may need to source bulbs separately depending on assembly design.

What's the wiring setup — does this plug into factory connectors?

Assembly comes with an integrated switch. Verify your vehicle has factory fog light harness connectors available; if not, you'll need to run new wiring from the battery or fuse panel.

Can I install this without removing the bumper?

Factory mounting points allow installation without drilling, but bumper removal may be required depending on your model's design. Test-fit before committing to full removal.