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Bard part 501-637-6 is an OEM left side assembly used as the left exterior cabinet side on select Bard wall-mount HVAC units, helping protect internal components while restoring proper cabinet fit and rigidity after damage or corrosion. Replacing the correct side assembly helps maintain the unit’s designed airflow paths and weather protection at the cabinet seam, which can reduce vibration, rattles, and water intrusion compared with bent or compromised panels. As a genuine Bard cabinet component, this part is intended to match factory mounting points and overall unit geometry for a straightforward swap when you confirm the part number against your unit model and serial information.