Cummins ISX 3685639 Cylinder Head Gasket PAI 131860ECROSS REFERENCE: 3685639 4299099 3689567 APPLICATION: Cummins ISX Multiple Use Application. BRAND: PAI 131860E Cummins ISX 3685639 Cylinder Head Gasket PAI 131860E. Replacement truck parts and aftermarket truck parts. Helps prevent oil and coolant leaks. 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 industry. This part is built