Note when you click on the part for instance 185 it indicates the number needed. In this case 2. The diagrams are not exact as it doesn't show where the second one goes. I know because I replaced them on my 107.
Part 186 may not be available from Mercedes but that doesn't mean it is no longer made. Click on 186 and part number A 116 301 01 50 shows. Google that and Amazon has it for around $6.50 ea.
There may be a picture in the online service manual.
Model 107 Maintenance Manual Index Click on your engine not chassis for complete manual.