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Basically the left hand side horn was missing on my car
Hello, these seem to look the same, although i have read the brackets changed over the years, so best check if they will fit your carhttps://www.mbclassics.de/bracket-set-for-horn-mounts-R113
Some background here: https://www.sl113.org/forums/index.php?topic=31075.msg225670#msg225670
I believe that's the right side, under the air filter.