1965 Mack Truck M15X Model Parts Book. Often used by service staff, parts books/lists/catalogs were used to simplify the process of finding the numbers of parts requiring replacement. Hopefully, you know what you are looking for as we are not certain if the parts book covers additional years or not.Army Chassis M15X 1063 Condition: Parts Books were used in Dealership Shops and thus can reflect such use, most often showing extensive signs of soiling, age, and wear. The information within is still legible and can give valuable insight. Details: W 9 x H 11.5 x D 1.375 Weight 44. Powered by SixBit's eCommerce Solution.