Large bolt pattern. The 15" x 8" Cragars have 4 1/4" backspace. I am going to shorten the axle housing a little and use some dr diff 1/2" offset leaf spring hangers. I have 245/60 coopers at the moment mounted on 7" cragars with 4 1/8" backspace. Don't want to buy the 8" wheels and they not fit...