Wasn't sure where to post this, 'scuse me if I'm wrong.
Looking for anything other
than universal fit drill-type mud flaps---as with most things E-Series if they exist they're nearly impossible to find--have been all over FTE and here, Google as well.
I could cobble something nice together that would work, essentially securing some sort of bracket or arm extending outward from the frame which would avoid drilling into the fenders or quarter panels. Like on big trucks some sort of thick-ish flap could be easily enough attached to said bracket/arm.
I'm sure this has been discussed here quite a bit---a search for "mud flaps" shows a lot of threads but nothing I could find about something specifically made or molded to the E-Series. I have a '05 but would assume anything on either sides of those years should work very well.