Storm door plastic retainer

I'm afraid I can't identify this part from this picture alone, but if it's a clip for a storm door window, I suggest you consider our 70-180 storm door clip as a replacement. To use this, you would drill a hole to secure the 70-180 to the face of the door with a 33-020 screw. The end leg of the clip has a 1/2" reach and should press up against the screen or glass panel in the door holding it in place. I would suggest installing four or five on each side and maybe two at the top. Let me know if this makes sense to you.