Fixation assembly for a lamp arrangement

A casing mount (6) holds and aligns a casing for a lamp structure. A guide rail (3) fastens on a bodywork part, on which the casing mount fastens. A screw (5) cuts into the material of a nut (7) to fasten the casing mount to the guide rail. A guide hole (8) on the guide rail/casing mount guides in a guide pin (9) on the casing mount or guide rail. An independent claim is also included for a lamp structure for a motor vehicle.