What does these bolts do?
 

Working on my w201 i cant figure out what these bolts do, why they are there and how the grommets should sit since the bolt interfare with the grommet?

there is a clamp which the bolt screw into but i dosent seem to hold anything. Same on both sides.

im talking about the rusty bolt above the brakeline. Pics from rear wheel
https://cimg8.ibsrv.net/gimg/www.mbw...d87988316e.jpg