Thanks guys!
Here's a quick video to show how the radius for the filler panel was done..
https://www.youtube.com/watch?v=ZnCTqLZg9lg
With the flanges turned both directions....
Looking at the rear of the fender that was adjacent to the cab, we found flat areas that seem to indicate some rubbing was occurring. So while we were fabricating the filler panel, we added about 1/8" to shove the fender outward away from the cab.
https://www.youtube.com/watch?v=4mZTMi3VMr4