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320,520,521,620,720,D21,D21U,D22U,D40 are all model numbers, in the early days the vin numbers were like "pl320" or "pl620", the d21 or hardbody, the d22u or frontier, were the first to actually have names instead of just a model number, the d22u is a frontier and the d40 is a frontier but totaly 2 different body styles, does any of this make sense or did it answer any of your questions?
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