I put them on like the instructions told me, because one slidder is longer than the other (the left is longer than the right). The bolts were already positioned in the slidders. I'll double check. Maybe the manufacture put the bolts in the wrong slidder by mistake. But I don't know, it might be aright because only the slidder turns not the bolt. Another thing is they have metal bushings in them. I just wanted to make sure because one I could turn the slidder and the other I couldn't.