This Ultimate Unit Bearing uses 9/16-18 studs on a 8 on 6-1/2 bolt circle, designed specifically for Spidertrax 35 splined axle shafts.
Spidertrax Offroad Ultimate Unit Bearing - FUBR861291635 Built ground up for Ultra4 rock racers, the Spidertrax Ultimate Unit Bearing is truly the reinvention of the unit bearing itself. It also has a right hand threaded spindle nut, intended to be used on the right side of your vehicle (USA passenger side).235 inch hub register for wheel centering and strength;California Residents: WARNING Genuine Timken bearings, full Chromoly heat treated construction, left & right hand threaded spindle nuts, and a fully integrated drive slug makes the Ultimate Unit Bearing the only racing unit bearing of its kind.