An elastically deformable coupling part for a plug-in connection for connecting a first component and a second component, has an inner connection portion, in which a head of a pin-like element of the second component can be accommodated by a detent or snap-in connection. In addition, the coupling part has an outer fastening portion, which can be connected to a keyhole of the first component by a bayonet closure. The fastening portion comprises at least one radial contact surface. At least one first radial projection, which forms a bayonet gap for a rotational accommodation of the first component, is arranged at an axial distance from the radial contact surface. At least one second radial projection, which forms a locking gap for the first component between the second projection and the radial contact surface by a movability directed inward, is arranged at an axial distance from the radial contact surface.