My take is jomichael is talking about cutting a hole in the center of the hub cap so the hub can poke thru it Christo. That would work to cover up the nuts but not the best answer if restoration is your goal.
The Filling Station lists 1957-60 3/4 & 1 ton truck part number L-315. Take a breath now, $70 each/$240 set of 4.
Denny Graham
Sandwich, IL