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

The DRL LED bars are integrated into the assembly. You'll need to source your own low-beam and high-beam bulbs separately — confirm the correct bulb type for your vehicle before purchase.

Will these plug directly into my existing wiring harness?

These are designed for direct mounting at factory points. For electrical connections, you may need to adapt or verify compatibility with your existing headlight plugs — test fit before committing to installation.

Can I install these myself?

Installation is straightforward if you're comfortable removing and reinstalling headlight assemblies. Basic hand tools are typically all you need. Check your service manual for any torque specs or safety steps specific to your vehicle.