In true racing style, Ultimate Unit Bearings are manufactured with both right and left hand threaded spindles. Which one goes where? Looking from the back of the vehicle, right hand goes on the right side of the vehicle (US passenger side) and left hand goes on the left side of the vehicle (US driver side). With this design, the spindle nut always stays tight in the drive direction. Time to go fast.
Step 1 -> Step 2 -> Step 3
Select your spindle thread.