Opel sources in Germany have told weekly magazine Autoweek that, soon after the September Frankfurt show, Opel design chief Martin Smith and GM Europe boss Mike Burns will ask GM North America to restart the flow of Opel models to the North American market. Opel last sold cars in the United States through Buick dealerships in the late 1970s though it did also, from the mid-'90s, ship over the relatively unsuccessful Cadillac Catera, a rebadged Omega, until it was replaced recently by the US-made CTS model.