The Karmann Ghia is equipped with a double horn, one producing a low tone and the other a high tone. To protect them from external influences, they are housed in a rubber cover.
This rubber protection will crack after a while, you can use all sorts of remedies but in the end the rubber will have a hole in it.
In a high level restoration, this rubber must protect the horns and you can only achieve this with a new rubber.
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