I've never looked, all I know is the stock first gen steelies are narrow as heck even some of the 15's
As far as I've been able to put together . . .
For Ranger, the sales brochures and the specification books list 14 x 5.0 for 1983 through 1987 for steelies, and 14 x 5.5 or 14 x 6.0 for the cast styles.
1988 the two sources disagree on the 5.0 and 5.5 being the smallest width, but 1989 onward (through '94) the minimum width 14" wheel of any type is 5.5. Also starting in 1989 the sales brochures stopped listing wheel dimensions, and only the spec books had them.
In 15" wheels for Rangers, 15 x 5.0 was listed through '86 (15 x 6.0 available all years).
Bronco II and Explorers were 15" wheels only. The B2 offered a 15 x 5.5 through '88 (15 x 6.0 available '84-'88 and standard '89-'90); the first gen Explorers ('91-'94) were 15 x 6.0 standard minimum with 7.0 as the upgrade.
That's for the 1983 through 1994 trucks only (being the years I collect).
You have dig into the (many!) footnotes in those sources, but certain towing packages and the cab chassis version could get some oddball wheel and tire sizes.
In a nutshell, factory wheels on 1983-94 Rangers, the Bronco II, and the first gen Explorer were 14" or 15" diameter, with widths of 5.0", 5.5", 6.0" or 7.0".