Do these fenders require drilling into my truck bed or body?

No drilling required. These over fenders are designed to mount to factory mounting points using existing fastener locations. Verify your vehicle's OEM hole pattern and hardware specifications before assembly.

What prep is needed before I paint these?

Sand the surface with appropriate grit to achieve good adhesion, then clean away dust before applying your base coat and topcoat. Follow your paint manufacturer's instructions for FRP surface preparation.

Will the extra 4.5 inches clear my tires, or do I need to measure first?

The 4.5-inch extension is engineered for oversized tire clearance, but your actual fitment depends on suspension lift height, tire diameter, and wheel offset. Measure your setup against the fender profile before final installation to confirm adequate clearance.