Do I need both left and right brackets, or can I run just one side?

You'll want both sides for proper bumper support and alignment. A single bracket leaves the bumper unbalanced and won't provide the structural support the design calls for. This is the right-hand piece — pair it with the left-side bracket.

Will this work with aftermarket bumpers or only factory bumpers?

This bracket is engineered for factory bumper mounting geometry. Aftermarket bumpers use different attachment points and may not line up. Verify your bumper's mounting hole pattern before committing to this bracket.

Are fasteners included, or do I need to source hardware separately?

Hardware is not included with this bracket. You'll need to source fasteners that match your vehicle's factory specifications — refer to your service manual for the correct bolt size and torque specs.