Caterpillar 1979642 Idler Pulley PAI 381245CROSS REFERENCE: 197 9642 1979642 APPLICATION: Caterpillar C7 C9 C11 C12 C13 C15 3126 Multiple Use Application. BRAND: PAI 381245 Caterpillar 1979642 Idler Pulley PAI 381245. Truck components and heavy duty parts. Provides belt support and maintains controlled rotation for stable accessory operation. 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