Do these fenders require mounting hardware, or does that come separately?

This set includes the fender panels only. You'll need to source appropriate bolts and fasteners to match your vehicle's existing mounting points. Check your OEM fender attachment method to determine the correct hardware gauge and length.

What prep work is needed before I paint these?

Sand the surface to promote paint adhesion, then clean off all dust. A light scuff with 400-grit or higher will ensure your chosen topcoat bonds properly. From there, follow your paint product's instructions for primer and color application.

Will these panels fit over my stock fenders, or do I need to remove the originals?

These are designed as over fenders, meaning they sit on top of or alongside your existing factory panels. You do not need to remove your stock fenders. Verify your vehicle's wheel gap and suspension setup to ensure adequate tire clearance once the wider panels are installed.