Yes, the wagon mounting is different. My '76 wagon's rear anti-sway bar is mounted to two short pieces of angle-iron that were bolted through the box frame just a bit forward of the rear wheels. I've still got the whole rear out of the car and I found that one of these bits had sustained a little damage - actually "tearing" out the hole used to mount the swaybar. Similarly, the front trailing arm bushing for this side had completely lost its rubber. It was just a worn bushing shell and a worn metal tube with a bolt through it. I was lucky that it did not deform the trailing arm bushing tube itself...

I wonder if one failure caused the other...