The ornamental design for end cap set for a flexiblestorm and/or solar barrier, as shown and described.
FIG. 1 is a perspective view of end cap set for a flexible storm and/or solar barrier, showing my ornamental design;
FIG. 2 is a front elevation view of the end cap set for a flexible storm and/or solar barrier of FIG. 1; the rear elevation view being a mirror image;
FIG. 3 is a right side elevation view of the end cap set for a flexible storm and/or solar barrier of FIG. 1; the left side elevation view being a mirror image; and,
FIG. 4 is a top plan view of the end cap set for a flexible storm and/or solar barrier of FIG. 1; the bottom plan view being a mirror image.
The broken lines are included for illustration purposes only and form no part of the claimed design.