Cummins ISX 3685639 Cylinder Head Gasket PAI 131860CROSS REFERENCE: 3685639 4299099 3689567 APPLICATION: Cummins ISX Multiple Use Application. BRAND: PAI 131860 Cummins 3685639 Cylinder Head Gasket PAI 131860 supported by heavy duty engine parts and USA truck parts. Prevents leaks and delivers consistent combustion sealing. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty truck parts