Will this bolt up directly to my existing brackets?

Yes. This assembly mounts at factory rocker and core support points — no drilling or fabrication needed. Just unbolt the old light and bolt this one in place.

Do I need to replace both headlights for matching appearance?

You're getting the right side here. If your left side is yellowed or damaged, buying both ensures consistent light output and appearance across the front end.

What about the bulb — is that included?

This is the assembly only. You'll need to transfer your existing bulb from the old headlight or source a replacement separately.