i think there are 4 screws, and several push pins. i could be wrong on how many screws there are, as mine didnt have the OEM Flares.
Hit your local Lowe's. They have specialty fasteners in their bolt cabinets. I think they have the ones you'll be looking for. If not they'll probably have something that will work the same that saves you a trip to a Ford dealer.
thanks guys! trying to get as much info and parts together for when i fix my front upper bumper cover....going to do my rockers and bumpers with rusto bedliner at same time. have to remove front flares to fix bumper cover and im going to remove rear flares when i do the rusto....