The IZM was the second batch of Ansaldo-Lancia built, with 110 cars of the improved model ordered in 1917; and all delivered before the end of 1918. Sometimes difficult to identify from the original Lancia IZ (Model 1916) the most obvious difference is the removal of the top machine gun turret, leaving just the one larger, twin machine gun turret. Other features that will help are that the first IZM's usually have two spare tires mounted on the right side of the vehicle (on the IZ they were under the rear). The cooling vents and front armor of the engine compartment are slightly different, and there are fewer vision ports in the armored crew compartment. The front fenders were also simplified. However, some of the original IZ series were modified to initial IZM standard by the removal of the extra top turret and up-dating the chassis. Making it possible to find photos of IZM's with both IZ and early IZM features.  American troops on the Italian Front during WWI trained with and used some of these vehicles.