Lionel Train Part 8030-100 Motor Truck for GP7,9,20, & U36B

This is a motor truck and field/top plate assembly for Modern Era Lionel Diesel locomotives GP7, 9, 20, and U36B. The motor field is untested and its coil may need to be rewound. The traction tires are in good shape. The wheels lock up in both directions in one spot. There are is some surface rust on the motor field.