Cummins ISX12 2881961 Main Bearing Kit Std PAI 171906FCROSS REFERENCE: 2881961 APPLICATION: Cummins ISX12 Multiple Use Application. INCLUDE: Main Bearing kit (1) 2869805 Thrust Bearing (4) OEM Number Description Quantity N A MAIN BEARING KIT 1 4999939 STD UPPER MAIN BEARING 7 4999940 STD LOWER MAIN BEARING 7 2869805 THRUST BEARING 4 BRAND: PAI 171906F Cummins 2881961 Main Bearing Kit PAI 171906F supported by heavy duty parts and diesel truck parts. Ensures smooth rotation, reduces friction and extends