The 'SHIM ST.MOTOR B.SCHILD DUC Citroen 11CV/15CV' is a thin metal ring used to correctly align the starter motor at the rear shield of a Citroën 11CV or 15CV. By using this shim, installation becomes more precise, reducing vibrations and wear. This part is essential for maintaining the correct condition of the starter motor and extends the lifespan of the components. This specific shim is designed to seamlessly fit the specifications of classic Citroën models, contributing to their reliable and efficient performance.