Cummins X12 5633521 Main Bearing Kit PAI 172098CROSS REFERENCE: 5633521 APPLICATION: Cummins X12 Multiple Use Application. DETAILS: OEM Number Description Quantity 5417293 LOWER MAIN BEARING 7 5417292 UPPER MAIN BEARING 6 5537423 THRUST BEARING 1 BRAND: PAI 172098 Cummins 5633521 Main Bearing Kit PAI 172098. Diesel parts and heavy duty parts. Supports controlled crankshaft load distribution. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified