Wow...just made a casual inquiry to a business that sells the Accuride Hub-Piloted, Dual-Mounting, One-Piece Flanged Cap Nut
10-Hole, 8¾" Bolt Circle, 6.25" Bore rims (a.k.a. part number 28160) and they are $293 each minus freight charges...
Still available used for much less if you look. I've seen them in junk yards and on complete trucks that would sell for enough as scrap to recoup most if not all the original purchase price ( = free wheels).
Grigg