Back some years ago when I first had my 2003 E-250 with the stock OEM "dual element" mirrors (hated 'em) and swapped them out for almost new set of the extendable towing mirrors, also Ford OEM--hated them as well.
IMHO they were only useful for towing anything wider than the van body, they provided nothing more like a better or bigger rear view. Almost immediately removed those and re-sold for a profit.
What I did was to convert my 2003 and 2005 "dual element" stock mirrors to those provided on 2007 and later, a single larger mirror element. I've since added a heater element that somewhat mimics a factory set-up making it nice having the mirrors de-ice themselves.
I like my current set up and it was carried over from my 2003 that was sold early last year.