85 - 87 HONDA ATC 250ES BIG RED REAR MUD FLAPS SPLASH GUARDS REPLACEMENT MOUNTING HARDWARE 

These are not OEM. They are the best alternative I was able to find as replacements.

Including: 

Stainless Steel Screws (6X)  (90102-HB6-000)

Steel Nuts (6X) (90303-HA0-680)

They will  fit OEM mudflaps and the 3D Printed mudflaps available in my store.

Fender, trim and mudflap shown in pictures are for reference and are not included.