We claim the ornamental design for an panel attachment extrusion with key, as shown and described.
FIG. 1 is a perspective view of a panel attachment extrusion with key showing our new design, in an assembled configuration of use;
FIG. 2 is a top view thereof;
FIG. 3 is a first side view thereof;
FIG. 4 is a second side view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a perspective view thereof, shown in an exploded configuration;
FIG. 9 is a second perspective view thereof, shown in a second exploded configuration; and,
FIG. 10 is a third perspective view thereof, shown in an in environment of use.
The broken lines in the figures represent environmental structure or portions of the panel attachment extrusion with key that form no part of the claimed design