Yep, you lost the bolt that holds the torsionbar/bushing assembly to the upper control arm. That's a known rust and failure area so hopefully the torsion bar is not buggered and the internal threads are still good.

It looks like the bushing in the upper arm where it passes through the body is failing, also. You can probably buy the torsion arm bushings, washer and bolt separately, but if it was me, I'd go ahead and buy the kit and replace the entire arm. The worn upper bushing probably contributed to you losing the torsion arm hardware. I'm not sure if the bolt comes with the kit--you might have to pull the one on the other side to get a size, or maybe someone here knows.

You need to check the other side anyway, as chances are it is worn, too.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"