Original 1944 Mack Truck Parts List. This Parts Book was used by the U.S. Government and the War Department to order Factory Replacement Parts for the Model EH 5 Ton 4 X 2 Cargo Truck, Model EH Bus, and Model EHT 5 Ton 4 X 2 Tractor. It has Parts Numbers, Descriptions and illustrations for these Parts. The back has an Alphabetical, Numerical and Pricing Index. This very rare Mack Truck and Military Book is in good condition for its age with minor wear, blemishing and soiling [see photos]. Parts List #1416A, TM 10-1680, dated February 1944.