POL - Tubular Upper Control Arms

Bought a set of Performance On Line Upper Tubular Control Arms and am trying to install, however they are hitting a piece of the frame in the downward travel. They are for the correct years. What am I missing here? If anyone can tell me where to find instructions or at least some pictures would be a great help. I have uploaded a picture and you will see where the arm fits in the piece on the right side is where it hits.
Gregg