Mack 63QT411 Wiper Motor PAI 4821CROSS REFERENCE: 25015982 33QT390R 33QT388 33QT436R 63QT43 8274 APMS6144J 63QT411 APPLICATION: Mack Multiple Use Application. BRAND: PAI 4821 Mack 63QT411 Wiper Motor PAI 4821. Truck parts and heavy duty truck parts. Ensures consistent wiper operation and stabilizes cleaning performance on the road. 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