Do these mounts require any drilling or cutting into my existing bumper?

Check your vehicle's OEM bumper for existing mounting holes and alignment points before installation. You may need to prepare the mounting surface, but modification extent depends on your specific setup. Test-fit the pieces dry first to verify clearance and hole alignment.

What should I use to prep and finish these headlight mounts?

Sand the surface to your preferred grit before applying your chosen primer and paint system. This ensures proper adhesion and a clean final finish. If you're matching OEM headlight trim or a custom bumper, prep both surfaces with the same technique for consistency.

Will these fit if my headlights are already modified or aftermarket?

These mounts are designed around factory headlight positioning. If your headlights have been relocated, resized, or heavily modified, verify that your light unit dimensions and mounting points align with the opening before committing to installation.