Do I need to buy the left side separately?

Yes — this is the right side only. If you need both sides, order the left assembly separately. Many drivers replace one at a time when damage occurs.

Will this need any adjustments after installation?

You may need a headlight alignment check after install to ensure the beam pattern sits correctly. Most shops do this in under 15 minutes if your lights feel off after mounting.

What about the bulb — is it included?

Bulb is not included with this assembly. Verify your bulb type in the owner's manual and source it separately — most auto parts stores stock common replacements off the shelf.