A connection strut of a chassis of a passenger car or utility vehicle for the connection between the chassis and the wheel carrier, preferably an axle strut or a chassis control arm, with an elongated basic body and at least two mount supports arranged at the end for introducing and leading out forces. In the context of the invention, the selected materials are optical materials which exhibit optical activity or a Faraday effect, such as an electro-optic material, and more specifically a polymer. The display box has an open top defined by a top wall panel edge disposed opposite the bottom panel.