Yes they do. I believe they make them both ways, so, you could either stick with the 8 on 170 all the way around, or switch to 8 on 6.5 all the way around. Search around on Ebay, they have everything, even though most stuff is rediculously overpriced.
Alaskan, it really isnt that hard of an adaptor to make, since both patterns are an 8 lug pattern, you would have the smaller diameter bolt circle, with 45º between each wheel stud, then you take the larger diamter bolt circle and put the holes for the stock wheel studs to stick through 22.5º off from the smaller bolt circle. It's kind of hard to explain with words, a lot easier with a picture.