2018 Mercedes-AMG GT C Roadster: The New In-your-face Roadster from the Three-pointed Star Published on March 29, 2017 in First Drives by Gabriel Gélinas Photo: Mercedes-AMG 2018 Mercedes-AMG GT C Roadster - The U.S. market gets both the GT and GT C Roadsters, Canada only gets the top-of-the-line GT C variant.