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Bard S509-455 is an OEM upper back cabinet assembly used on Bard wall mounted packaged air conditioners to restore the proper rear cabinet structure and airflow separation where the upper back panel ties into the rest of the cabinet. Replacing a bent, corroded, or damaged upper back helps keep the unit aligned, reduces vibration and rattles, and supports correct panel fitment so other cabinet components seal and mount as intended. This part is commonly listed in Bard cabinet component sections as the Upper Back and is built to meet Bard’s original fit and service requirements, so it is a dependable choice when you want the replacement to install like the factory piece.