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Bard part S509-423 is an OEM upper back assembly used on select Bard wall-mount air conditioner cabinets to restore the correct rear upper structure and mounting interface for internal components. This panel helps keep the cabinet properly aligned and sealed so airflow paths, coil compartment spacing, and overall unit integrity remain as designed by Bard. Because cabinet pieces vary by model series and material packages, confirm S509-423 against your unit model and serial number or the correct Bard parts manual before ordering to ensure proper fit and screw hole alignment.