Abstract: A hollow elongated support structure designed in particular to support a motor vehicle fittings located at right angle with the instrument panel, the ends of the structure (10) including an end flange (100) arranged transversely for fixing and/or maintaining the instrument panel itself, and/or for fixing the hollow support structure (10) to the vehicle body: each end flange (100) is integral with a plastic end cap (20, 30) inserted into the support structure (10), at the ends thereof with which it is integral.