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For E-Class CLS-Class W212 W218 Vehicle Accessory Parts Reliable-Door Seat Memory Control Adjustment Switch Replacement number: A2129050251 (Left), A2129050351 (Right) Direct replacement unit For proper fitments, No Modification Needed Precise Positional Fine-Tuning:The system allows for continuous, stepless adjustment—freeing you from the limitations of fixed mechanical notches found in manual systems—enabling you to fine-tune the seat to the exact position that offers maximum comfort. Optimized Driving Visibility:Through precise height adjustment, drivers of varying heights can position their seats to achieve an optimal forward field of view, thereby enhancing driving safety.