screen window pvc extension trim

Hi, I've purchased other parts from you previously and hoping you can help me here...I have two vinyl sliding windows where there is a gap between the frame and the screen. I looked at another window and determined there is a piece of trim that snaps into the window frame that closes the gap between the window opening and the screen. The longest side (that extends to close the gap) is .75" and "U" shape that fits into the window frame is 3/8" wide and deep. Any chance you have something like this? this is a house I purchased and can't tell what type of windows these are. Thanks