Will these fenders work with my stock bumper and side trim?

Yes, over fenders mount independently to factory attachment points and do not interfere with bumper fitment or door seals. Verify clearance at the rocker line where the fender extension begins, especially if you've lowered the vehicle.

Do I need to sand and prep the surface before painting?

Absolutely. Sand the surface with adequate grit and prep the panels per your chosen paint system's requirements. A smooth, clean base ensures proper paint adhesion and a professional finish.

What fasteners do I need to install these?

These panels bolt to existing factory mounting holes. Source fasteners that match your vehicle's OEM hardware specifications — typically metric bolts and washers. Reference your service manual or contact a local dealer for the exact fastener size and torque values required.