Do these over-fenders require the complete wide body kit?

Yes. These front fenders are designed to work as part of a full Circuit-style wide body package. They won't fit correctly or look proportional as standalone pieces.

What prep work is needed before painting?

The FRP arrives in raw FRP condition, so light sanding and a cleaning with wax and grease remover is all you need before basecoat application. No additional primer coat is required unless you prefer extra coverage.

What fasteners do I need to install these?

Installation hardware is not included. You'll need appropriate bolts, washers, and clips to secure the over-fenders to your factory fender panel—check your wide body kit documentation for the exact specification.