Might be a long shot but give Randys ring and pinion a call, that or start scouring junk yards for a ring or hub.
Or grab the bore diameter and thickness and call these guys? might be a different style but if they can find the correct diameter and thickness maybe you would be in business?
http://www.americanring.net/bearingapps.aspx?appid=2
http://www.smalley.com/retaining-rin...-section-rings
http://www.smalley.com/ring/vh-400
http://catalog.daemar.com/viewitems/...ngs?&pagenum=2
https://www.motionindustries.com/tax...ings/browse/en
Here's another thought, would a ring from a 14 bolt work?? read this thread.
http://www.billavista.com/Tech/Artic...ble/index.html