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1961-1998 rims are "8 on 6 1/2", then in 1999 they went to 8 on 177MM
Some other guru will know the wheel paint code. Black rattle can or silver?
16's give you tons of tire choices, so a very good call.
16.5's hardly NO tire choices at all, unless you want to run military takeoffs 36's or 37's?
And if you do find 16.5 that are 31",33",35" new $$$$$$$
Also with the stock steelies paint to match truck color and then get a chrome center cap, chrome lug nuts and a 16" chrome beauty rim, old school dress up rim trick.
Not my personal pic, but a good example of the 2 tone rim and beauty ring. If they would paint the center hub silver or put a chrome center cap and put on some chrome lug nuts, POW nice rim.
As far as 74 4x4 stock steel rim color? Someone will know....