this piece is located in the upper right and left corners of the removal storm window. Appears to be plastic or nylon. piece is held in place with a Phillips self threading counter sunk Metal screw at each corner.
Purpose is to hold the top of the window in place when raised and lowered. Also helps in removal of window for cleaning.
2 per window. I will need a quantity of these since they all have deteriorated due to age.
THANK YOU
Jim