Ball Joint Question

Hey guys, I got a new set of upper ball joints for the Dart. I am swapping for the bigger ball joints and ordered them for a 73. I have the correct socket for the ball joints and was wondering if they changed it? Or the style of ball joints? The joints I got fit the diameter of the socket, and fit in the threaded part of the a arm but, there is a bulge on the top of the ball joint where the grease fitting goes. My socket won't go down onto the joint far enough to turn it in. The last set I did had flat tops on the ball joints but these one's have a big round top.... any ideas? wrong ball joints? Or two sockets?