The ornamental design for a verticalmemberextrusion, as shown and described.
FIG. 1 is a perspective view of a vertical member extrusion showing my new design; and,
FIG. 2 is an end elevational view of the vertical member extrusion of FIG. 1.
The vertical member extrusion is shown with a symbolic break in its length. The appearance of any portion of the vertical member extrusion between the break lines forms no part of the claimed design.