I am currently in the process of installing a 3" teraflex lift kit that comes with 4 flex arms. Everything was going OK until I needed to install the rear upper control arms. The directions say that it should be set for 18 1/2" which I would imagine is center to center on the bolt holes. Is this correct? The instructions also show the adjustable side of the arm going to the rear axle... this does not appear to be correct... as the arms call out which side they are for and say sticker up. It also appears there is approx. a 1" difference now with the control arm lining up into the rear axle bracket. I would imagine I just need to shift it around after I put the springs in? Hope this isn't to vague of a question.