Window Frame- Screen Holder

The vinyl part snaps into the exterior of window frame and into a groove in the middle of frame. The part holds and keeps the sides of the screen from being pushed back to the glass window, once it is installed. Without part, a large gap would be seen on the sides. One pic shows end view of part, another a view from inside window, another from outside and the last one with the part removed. I need two pieces 30 inches long. No identifying numbers or names on windows.