Do I need the left side bracket too?

You're buying the right bracket only. If you need both sides, order this one plus the left-side version. Many people replace just the damaged side, so check your install before committing to a pair.

Will this mount to existing holes on my bumper?

This bracket is designed for factory mounting points. Test-fit it on your bumper cover before final installation to confirm alignment with your existing attachment holes.

What hardware do I need to bolt this on?

Bracket assembly only—fasteners not included. You'll need bolts and hardware that match your vehicle's original setup. Refer to your service manual or compare with your existing bracket for size and thread spec.