The ornamental design for a profile for a co-extrusion, as shown and described.
FIG. 1 is a front view of a profile for a co-extrusion showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a first perspective view thereof; and,
FIG. 8 is a second perspective view thereof.
The broken lines respresent unclaimed subject matter and form no part of the claimed design. The diagonal broken lines in in FIGS. 3-8 indicate indeterminate length and form no part of the claimed design.