The ornamental design for an extrudedseatbackframe with adjustable track system for a wheelchair, as shown and described.
FIG. 1 is a perspective view of an extruded seatback frame with adjustable
track system for a wheelchair showing my new design, the broken lines are
for illustrative purposes only and form no part of the claimed design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side view with the left side being a mirror image
thereof; and,
FIG. 5 is a top plan view with the bottom being a mirror image thereof.