Well my fenders came off my Ranger F100 parts truck and I was able to put on Custom F100 badges.
I am thinking the holes will be the same.
You could pry yours and the others off and see.
Also that molding on the white fender how is it held on and dont hurt it as I am sure you can sell it.
There may be holes in the fender for that molding.
As for selling could try for $40 OBO
Thing is are you willing to ship and if so that may be more than what they are worth.
Could play it forward and give them away local pick up only and show the pictures.
As for stopping the rust look at the new fenders and you will see there is no easy way to spray under coat in there and I would not use that on my fenders.
Look at Eastwood site for internal frame coating. It comes with a straw and a end that sprays 360*
Use that on each fender in that areas and it will coat it to keep it from rusting.
Eastwood also has other rust fighters do a search for "rust".
Dave ----