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The Bard 501-403-4 is an OEM Right Side Assembly used on select Bard wall-mounted and packaged HVAC units to restore the unit’s structural side section and proper cabinet alignment after damage, corrosion, or service access wear. Replacing a bent or compromised side assembly helps keep the cabinet sealed and supported so internal components remain protected and the unit maintains correct panel fit during operation. Because side assemblies can vary by model family and cabinet configuration, match this Bard part number to the unit model and serial and confirm right-hand orientation before ordering.