There are two possibilities: 1) The condition of the Toyota is part of the unreal condition If he had more money and the new model Toyota became available, he would be able to buy it. 2) The condition of the Toyota being manufactured is not an unreal condition, but a certainty: "If he had more money, he would be able to buy the new model Toyota when it becomes available.. The way you wrote it is not as clear, due to the placement of the clause.
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