The rubber mentioned here can only be found on the Karmann Ghia convertible. It is located at the rear side of the door and connects the door window rubber with the rear side of the door.
These end rubbers are part of the waterproofing of the convertible top. They are no longer present on many convertibles, or they are so worn that we can no longer speak of a rubber.
Also take a look at the tab 'related' where more specific rubbers for the doors of the Karmann Ghia are listed.
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