A connector (1) for fastening a first component (100) to a second component (200) of a motor vehicle, includes a bearing collar (10) for bearing against the first component (100), a crossbar (20) having one or more upper bearing surfaces (21.1, 21.2) for bearing against the second component (200) and for bracing the second component (200) against the first component (100) in a rotated final assembly position, a shaft portion (30) for passing through corresponding apertures (110, 210) in the components (100, 200), and fastening means (40) for fastening the connector (1) to the first component (100) in a preassembly position. A rotation-blocking device (50) is configured to block rotation of the connector (1) in relation to the first component (100) in the preassembly position and only to release said rotation when the connector (1) has moved from the preassembly position in the direction of the final assembly position.