Do these need bulbs, or do they come with them?

Bulbs are not confirmed as included — you'll want to verify what's in the box when it arrives. Most corner lights use standard replaceable bulbs available at any auto parts store.

Will these bolt straight to my bumper without modification?

These are designed around factory mounting points, so they should align with your OEM bumper. Test-fit before final fastening to confirm clearance and alignment.

Do these come with any wiring harness or clips?

Only the light assemblies are confirmed in the box — mounting hardware and wiring details aren't specified. Have basic hand tools and your service manual on hand before you start, and confirm what fasteners or connectors you'll need based on your vehicle's original setup.