The "SHIM ST.MOTOR B.SCHILD CIT 1.0 Citroen 11CV/15CV" is a thin plate used as a spacer for the starter motor in Citroën vehicles, specifically the 11CV and 15CV models. This shim aids in precise adjustment and alignment of the starter motor, ensuring optimal performance. It compensates for any discrepancies or wear in the mechanical assembly and ensures smooth operation of the starter motor. It is a crucial part for owners performing maintenance and restoration on classic Citroën vehicles, preserving the authenticity and functional integrity of the car.