Do these fenders require any mounting hardware?

The set includes the fender pieces only. You'll need to source appropriate fasteners and mounting brackets compatible with over-fender installation on your existing body.

Can I install these without removing my factory fenders?

Yes — that's the advantage of over-fenders. They bolt directly over your stock panels, so you don't need to remove or modify anything underneath.

What prep work is needed before painting?

Since these arrive in raw FRP condition, light sanding and a base coat of primer is recommended before applying your final color or clear coat for best adhesion and finish.