Weird, the steel wheels for fullsize trucks have been/were 5 1/2" for many, many years. All the one's I have ever seen, that had the 5.5 bolt pattern, were 5 1/2" wide. Only the 4 1/2 bolt pattern is 6".
These are probably the neatest factory alloys in my opinion... I think Alfie was looking for a set for his bronco... I’ll have to message him just in case he is interested.
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2
The master parts catalog doesn't show anything narrower than 6.0": Driveline/Wheels.
My son's 1984 [4X2] was "born" with black 5 1/2" wide steel rims. I worked with a man who purchased a 1984 F150 [new] with white steel rims [because it was 4X4?] and dog dish caps. I bought these rims and put them on my son's truck [after painting them black]. They were date stamped '84 and were 6" wide [4X4]. The rivets used on the 6" wide rims were larger than the ones on the 5 1/2" wide rim.