Opel cars appeared under their own name in the U.S. from 1958 to 1975, when they were sold through Buick dealers as captive imports. The best-selling Opel models in the U.S. were the 1964 to 1972 Opel Kadett, the 1971 to 1975 Opel Manta, and the 1968 to 1973 Opel GT. More @Wikipedia
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