Will this bolt straight into my existing headlight opening?

Yes. This assembly uses factory mounting points and housing geometry, so installation is a direct swap. No drilling, cutting, or bracket fabrication needed—just unbolt the old unit and secure the new one.

Do I need to buy a right-side headlight to go with this?

This is a left-side unit only. If you need both sides replaced, order a matching right-side assembly separately. If you're replacing just the damaged side, this one stands alone.

What about the bulb—does it come installed?

The assembly ships as a complete housing unit. Confirm your vehicle's bulb type (HID, halogen, or LED) before installation, and source a replacement bulb if the old one is damaged.