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Bard part S509-290 is an OEM back assembly used on select Bard wall mounted air conditioners and related package units to restore the rear cabinet structure and proper equipment fit at the wall interface. Replacing a damaged or corroded back section helps protect internal components, supports correct panel alignment, and reduces the chance of air and water intrusion caused by cabinet gaps or distortion. This Bard factory part is intended to match original mounting points for a straightforward swap when you verify compatibility by model and serial number before ordering, since back assemblies can vary by unit series and cabinet configuration.