FWIW, with some ingenuity and some thin sheet steel from Lowe's I bet you could make up a set cheaply, easily, and with basic tools.
I have a set right now to replace the missing ones on my crusty 96 2.3 4x4. They are about as good as I can find for original in MA but need a little help. I have thought about making new ones using these as templates, guess I have extra reason to try now
Basically if you bought steel sheet metal of the right thickness at Lowe's (they do carry it), I don't see any reason why you can't trace them out, leaving excess around perimeter to form the bent edge found on OEM ones, use sheet metal snips or cut off wheels to cut them out, bend the edges with pliers, drill holes for mounting, and you're done. With some finesse they probably wouldn't even look bad. Sheet steel is very forgiving. The dust shields on the explorer axle we put in my brother's Ranger were clean but crunched up badly from dummies at the wrecking yard, I was able to smooth those back out to the point where you'd almost never know.
I'll get around to trying this to make some this winter and make a thread