Fastening device for a lighting arrangement

Fastening device for fastening a light arrangement to a body part (4) of a motor vehicle, with a housing bracket (6) for holding and aligning a casing (1) of the light assembly, is fixed with at least one guide rail (3) attached to the body part (4) is fixed (at which the casing holder (6) and aligned, with at least one nut (7) and one each in the material of the nut (7) self-tapping screw (5) for fixing the casing holder (6) with the guide rail (3), arranged with at least one of the housing bracket (6) or on the guide rail (3) guiding pin (9) and one on the guide rail (3) or the casing holder (6) provided guide hole (8) for introducing the guide pin (9) and to the mutual alignment of nut (7) and screw (5).