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Bard part number S501-1052-1 is an OEM inner left side assembly used on select Bard wall mounted HVAC units to restore the internal cabinet structure and proper component alignment after corrosion damage or service access wear. This internal sheet metal component helps support and isolate critical sections inside the unit so airflow paths, coil clearances, and service panels fit the way Bard intended. Replacing a bent or deteriorated inner side assembly can prevent rattles, air bypass, and misalignment that leads to premature wear on nearby parts. Confirm compatibility by matching the full unit model and serial information before ordering to ensure correct fit.