I am pretty sure you can get 16.5" X any width and in any bore you like and need from Stockton's(?) custom wheels or something close to that.
I will check for you with a old timer that has a grave yard of old 4x4 trucks near me, last time a visited him he had a few old 70's, 80's trucks with the equivalent of 33" or larger tires on old 8 lug steel wheels Ford, Dodge, Chevy etc...
I like the look of wide OEM steel wheels, but other then the Atlas HD steel, everything I have come upon is rated for not more then 2000 lbs. , what are the OLD wheels rated for?