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The B1376853 is a genuine OEM Goodman motor mount arm (mounting bracket leg) designed as a direct-fit component for the ADPF304216AC air handler. The mount arm secures the blower motor to the housing belly band, holding it centered and rigid so the blower wheel spins true. A bent, corroded, or missing mount arm allows the motor to shift, causing vibration, noise, and accelerated bearing wear.
The OEM mount arm matches Goodman's exact hole pattern and bend geometry, so it bolts up to the belly band and housing without modification. Universal aftermarket legs may require drilling or bending to fit and can compromise motor alignment. At this price point, the genuine part is the obvious choice.
Easy. Typically one of three legs on the motor band — loosen the band, swap the arm, and re-secure. Plan 15–30 minutes. Disconnect power before servicing and verify the motor sits centered in the housing before tightening.