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I'm pretty sure all the solid axle stuff is 8 on 6.5" bolt circle. Not sure about any of the newer stuff but i know Ford did go to a metric bolt circle in the later years.
No, all GM and Dodge 8 lug is 6.5", from the 60's to current. Ford is also 6.5" until '98, that year they went metric, the 8 on 170mm that you mention.