Do these fenders require drilling or modification to the existing body?

No. These over fenders bolt directly to factory mounting points without cutting, drilling, or welding. You'll need standard hand tools and fasteners to secure them during installation.

What should I do to prepare the surface before painting?

Sand and prep the raw FRP surface with the grit appropriate to your chosen topcoat system. Clean thoroughly to remove dust before application. Follow your paint manufacturer's instructions for adhesion and curing.

Will these interfere with my wheel fitment or tire clearance?

The 50mm extension adds width to the rear quarter. Verify clearance against your wheel offset and tire size before installation — roll the wheels and check for contact along the full suspension travel. Adjust your setup if needed.