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Bard part number 500-421 is an OEM Side Assembly used on select Bard wall mounted air conditioner and heat pump cabinets to restore the proper side structure and panel alignment when the original section is damaged, corroded, or bent. Replacing the correct side assembly helps keep the cabinet sealed and square, which supports reliable airflow paths and protects internal components from weather exposure and vibration related wear. Because side assemblies can vary by model series and cabinet generation, confirm fit by matching 500-421 to your unit model and serial number in the appropriate Bard parts list or service manual before ordering to ensure a direct, no modification replacement.