I had been looking for a set of hub cap style wheel for my '80, and finally just bought them new from Toyota via Mudrack's Custom Cruisers in Sonoma. Since they are the same wheel as on the FJ40 Toyota still makes them today! I wish Toyota supported the pickups like they do the landcruisers! Your local dealer can get them too, if you want the PN I can find it. PM me.
$125 each is the price he gave me.
Good luck