Can I buy patch kits to fix rusted hole above rocker panel? on 2002 Pontiac Bonneville

Where can I purchase a piece of metal above rocker panel in front of rear tire. Is there after market kits I can buy?

Asked by for the 2002 Pontiac Bonneville
I don't think there's a kit ,I just go to buddys house and get metal ,you can goggle online and see though...