Take a look at the link below...

W123 rear bumper 'fix'...

Be sure to get the same style muffler clamp...you need to tighten it around the bumper strut from the top and bottom....the "U" shaped clamps won't work. I used stainless steel bolts when I did mine...they looked a bit better and won't rust. I also rustproofed the strut with POR 15.

And I don't let kid drive the car...

__________________
1985 300D 172,110mi and goin' strong