I have to say in all the years working with Mopars I've never heard of XJSET model. Could you let us know what model car you have? And when you say link assy, do you mean the arms and pivots?
I have a 1980 Gran Fury, 225 slant 6, the piece in question is a little orange plastic disc that sits on the windsheild wiper motor. The disc has 2 little flanges that the wiper arms connect to. Hope this helps. If not I can take a pic when I get home on friday.