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The Bard 509-445BX Upper Back Assy (boxed) is an OEM upper rear cabinet assembly used on select Bard wall-mounted packaged units, providing the correct factory fit and structural support for the upper back section so panels and internal components align properly after service or damage repair. Because this is a Bard OEM assembly, it is built to match the original unit geometry for straightforward replacement and dependable long-term durability in the field; always confirm compatibility by matching your unit model and serial information to the applicable Bard parts list before ordering.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.