Do these mount at factory attachment points, or do I need to drill?

These use factory mounting points — no drilling required. You're connecting to existing holes and wiring channels already designed into your vehicle.

Is the switch pre-wired, or do I need to splice into my harness?

The switch comes pre-assembled and ready to connect. Confirm your vehicle's existing switch connector type before install; adapter harnesses are widely available if needed.

Do I need to remove the front bumper to install these?

Bumper removal is typically required to access the mounting points and wiring channels. Work time is usually 1-2 hours for experienced installers with basic hand tools.