Will this mount using the factory holes on my hatch?

This is designed for direct replacement at the factory third brake light location. Test-fit before final installation to confirm alignment with your specific vehicle.

Do I need to splice into my existing wiring harness?

The wiring connection method depends on your vehicle's factory setup. Have your service manual on hand to confirm plug type and wire routing before you start the swap.

Is this street-legal for my state?

LED third brake lights are legal in all 50 states as long as they meet brightness and color standards. This unit is designed as a direct OEM replacement, so it complies with those requirements.