Do I need to replace the hub on both sides or just one?

Depends on which wheel is worn or damaged. You can replace just the one that needs it, but many shops recommend doing both sides at the same time to keep braking and handling balanced.

Will I need new bolts or fasteners to install this?

Reuse your existing factory bolts—they're designed to work with this assembly. Have your torque wrench handy and follow your vehicle's service manual for the correct spec.

What tools do I need to swap this out?

Basic hand tools, a jack, jack stands, and a torque wrench. You'll need to support the vehicle safely and remove the wheel and brake assembly to access the hub. No special pullers or presses required for installation.