Cross-piece arrangement and bracket for such an arrangement

The arrangement has a crosspiece (1) and a transverse underrun bar (3) mounted on a chassis of vehicle at same time by identical brackets (2). Each of the brackets has a flat main part (21) comprising a fixing area (22) for fixing one of the brackets on the chassis and another fixing area (23) for fixing the crosspiece on the bracket. The latter fixing area has wings (24, 25) for fixing the crosspiece and the bar on the bracket. The wings are separated from each other and extended transversally with respect to the main part. The wings are folded in opposite directions.