Caterpillar 2124284 Camshaft PAI 391872CROSS REFERENCE: 2124284 212 4284 10R1971 APPLICATION: Caterpillar C7 Multiple Use Application. BRAND: PAI 391872 Caterpillar 2124284 Camshaft PAI 391872. Truck repair parts and heavy truck parts. Provides valve support and maintains controlled motion for stable camshaft function. 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