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Bard part number 500-391-4 is an OEM left side assembly used on Bard wall-mounted HVAC units to restore the factory cabinet fit, airflow separation, and overall structural integrity after corrosion or physical damage. As a genuine Bard replacement side assembly, it is built to match original mounting points and cabinet geometry so panels, doors, and internal sections align correctly, helping the unit maintain proper sealing and service access. Because this is a cabinet side assembly, confirm compatibility by model and serial number and verify the side orientation before ordering to ensure the correct match for your specific Bard wall mount configuration.