The ornamental design for a roofrackcrossbarextrusion, as shown and described.
FIG. 1 is a perspective view of a roof rack cross bar extrusion showing the design of the invention. In the drawing and other drawings below, the broken away portions represent that no particular length is claimed.
FIG. 2 is a front view thereof.
FIG. 3 is the rear view thereof.
FIG. 4 is a top view thereof.
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a side view thereof; the opposite side being a mirror image thereof.
The breaks in the drawing figures show no specific length.