The 4932910 fan support, which can be replaced by 3960076, is designed for Cummins 4B3.9, QSB3.9, ISB4.5 and ISD4.5 engines. This heavy?duty bracket firmly holds cooling fan assemblies and dampens operating vibration. It prevents wobble?caused abrasion to adjacent parts. Reliable mechanical strength extends service life for cooling systems on light?to?medium duty machinery.