Motor vehicle headlamp module with bayonet attachment, corresponding mounting and headlamp

The module (2) has a light source i.e. LED, for emitting light rays. A reflector (10) reflects the light rays emitted by the light source as a signaling and/or lighting beam along an optical axis (1) of the module. A quick fixing unit is positioned between two longitudinal ends of the module along the optical axis of the module. The fixing unit has a fixing flange (6) comprising legs (16) engaged with corresponding notches (25) of an opening (22) of a support (18) for fixing the module to the support. A gripping element is arranged on a radiator (12) used for cooling the light source.