I just purchased a 1995 F250 supercab, 5 spd manual, manual transfer case, 460 c.i. and have been looking at replacing the wheels and tires. I had originally thought the thing had 7 lugs because of the wheel covers (it looks like the lugs come through the wheel covers) but after removing the covers it indeed has 8 lug axles. Thankfully!!
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I don't think the 7 lugs were ever used on anything except for the heavy half F150's (though I could be wrong), so I'd expect the F250 to have 8 lug wheels. I happen to have a 7 lugger so I know how big a pain finding wheels for that can be.

That thing with a 460 5 speed, it must be a real beast!

Hope you enjoy your truck, looks good.