does one pair of control arms have the outer shell still pressed in while the other paid doesn't?

also, from your other thread, and a similar thing happened to me...the strut rod locates the whole lower control arm well enough that if the strut rod is too long for some reason, you can use the LCA pivot bolt to actually pull the pivot pin out of the LCA. think about how much locating fore and aft the LCA bushing is actually doing.