The 'SLOTSTANG RUBBER ACHT.210045/6' is a crucial component for the Citroën 11CV and 15CV, designed to optimize the vehicle's locking mechanism. This durable rubber piece ensures a perfect seal, preventing unwanted vibrations and noises while driving. It helps in maintaining the original performance and comfort of these classic Citroën models, extending the lifespan of the lock mechanism. Easy to install, this essential replacement part is necessary for those who wish to keep their classic car in peak condition.