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Bard 135-177-4 is an OEM side trim piece used on select Bard wall-mount HVAC units to restore the original cabinet edge fit and alignment after service or panel replacement. This trim helps close up gaps along the side of the unit, supports a clean cabinet-to-cabinet fit with adjacent trim pieces, and helps protect the cabinet edge from vibration wear and weather exposure common to exterior installations. As a genuine Bard replacement part, 135-177-4 is made to match the factory mounting points for a straightforward swap, which is why we recommend confirming your model and series in the Bard parts list before ordering to ensure proper fit.