I'll buy that this info is only good up until Ford quit building trucks in '97. All Ford 1/2 tons, Jeep CJ's, and International 1/2 tons have the same bolt pattern - 5 X 5 1/2. The only difference in the three makes is the center hole.
Ford's have the smallest, which is good if you drive a Ford cause then you can use all 3 makes. You can use a Ford wheel on the back of a Jeep but the front hub is larger and the center hole won't fit. You get the idea...
I've seen many a 67-72 Ford pickup and van with the smaller 5" bolt circle, like cars, I personally think you'd be safe in assuming that "late model" wheels will fit back to ' 73, while we're on this subject what gives with the "standard duty" F250 as of late using a 7 LUG wheel ????
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