A0 is first generation unofficial name. All the rest are designated in their ID number as A1, A2 etc. thus the first generation became called A0 though it would not say that in the ID number... For example, you've stated yours is an M1078A1 where before that it would be just M1078?.... don't recall for sure if they had an "A" in them or no "A" at all. someone will step up and clarify. Later "Phases?" or new "Production?" that has a bit of a significant change to the previous model would have something like M1078A1P2, or if more significant such as a completely different axle then the A's numeration would move up a notch. M1078A2 for example.Sorry what is an AO?
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