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In page Opel Kadett:

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The Kadett B was launched at the Frankfurt Motor Show in late summer 1965,[1][2] The Kadett B was larger all-round than the Kadett A: 5% longer both overall and in terms of the wheelbase, 7% wider and 9% heavier (unladen weight), albeit 10 mm (0.39 in) lower in basic standard "Limousine" (sedan/saloon) form.[3] Production ended in July 1973, with the successor model introduced a month later following the summer shut-down, in August. The two-seat Opel GT was heavily based on Kadett B components, its body made by a French contractor, Brissonneau & Lotz, at their Creil factory.