The inner and outer are interchangeable, however, each side must have a LH and a RH threaded tie rod end in order to function correctly. I personally always place the LH threaded ends on the right side out position and the left side inner position. This way when I rotate the sleeve up at the front the rod becomes longer. Rotate either downward and the rod shortens. That way I do not have to think too hard when doing an alignment!?!