Hopefully the end-link mount bracket is still there on your car -- did you check? The photo doesn't show the right angle to see it...

 

I was about to say that the end-link is gone. I found out the same with mine.

And FWIW - I'd think about replacing both end links at the same time - the other (rusted) existing link probably won't last long when the stronger newer link goes into place...

 

My bet is that the bolt running through the end-link assembly rusted out, rather than the mount snapping off the body as the end of the swaybar has nothing through it...

 

So we find that you DO have a rear sway bar you just dont have end links. Pretty common really I have found a few 4th gens I have looked at have the bar but no links. Just get a set of links and reinstall them and you should be good to go. Moog has a set with poly bushings the bolt is nickle and cadnium plated to prevent rusting.

Massey

 

^ I don't know if I would use poly -- it's not ideal in parts that have to move because it's sticky and can bind and compromise movement of a part. Granted there's not a ton of movement in end-links. I think it's an even worse idea on the sway body mounts because of this.