The sales approach for the Opel line in the U. S. market was equally unusual. The Manta A was one of only a few Opel models sold in the U. S. Opels were imported by GM and sold through Buick dealerships and not their own dealership network, so they were limited in what makes and models they could sell there. Other Opel models sold in the U. S. were Rekord P1 and Rekord P2 (1956–1961), Kadett A (1964–1966), Kadett B (1967–1971), GT (1968–1973), and the Manta / Ascona A (1971–1975). The Ascona A was the saloon version on the Manta A chassis and was sold in the U. S. under the "1900" name as a two-door and four-door saloon, and as a two-door "sport wagon". The only difference between the Ascona and Manta was exterior sheet metal, glass and trim. The frame, mechanics, dash, front seats, and many other parts were shared between the cars. The Manta was even sold as the "1900 Sport Coupé" in 1971 and 1972, rather than as the "Manta". In 1973, the Manta nameplate was added to U. S. -spec Mantas, but the Asconas kept the 1900 badge throughout their model life. The last year GM imported European-made Opels into the United States under the Opel marque was 1975. In that year the only Opels imported were the Manta and Ascona A.