I could find a match for the original clips to mount the fender seal here in the UK so I used these "fir tree" clips.
Because they're a paralell clip you have to enlarge the holes on the seal bracket to the same size as the ones in the fender support (from 5/16" to 3/8")
They're a tight fit so you'll need a mallet to tap them in
And they're plastic so no rust issues