Do these over fenders require drilling into my existing body panels?

No drilling required. These bolt directly to your existing fender structure using factory mounting points. Verify clearance around wheel arch and suspension components before final installation — your vehicle's service manual will confirm all mounting hole locations.

What prep work should I do before painting these?

Sand the primer surface lightly to improve paint adhesion, then clean away dust with a tack cloth. Apply your chosen primer and topcoat system directly to the prepped FRP surface. No special base coat is required — FRP accepts standard automotive paint.

Will the 50mm extension cause tire rub or suspension interference?

The over fender sits outboard of the wheel well opening and does not affect tire clearance. Check wheel backspacing and suspension ride height against your fender profile — if you're running aggressive offsets or lowered suspension, physically verify fitment at full compression and full droop before fastening permanently.