Snap in glazing for screen/glass storm door
The short length is 29" and the long is 72".
We unfortunately don't sell a replacement retainer strip that matches this. Retainers like this are incredibly difficult to supply due to the fact that every storm door manufacturer makes these a different way, and then often discontinues the model after they make it.
But it's not all bad news. What storm door companies use to do back in the day was use retaining clips, not strips. These are smaller pieces of plastic that are distributed evenly around the frame and more or less do the same job, just with less material and a little more manual labor. See our 70-180 and 70-112 for a common selection. The catch is that you will need to drill new holes for these retaining clips, but if you can do that then it should work fine.
You may want the help of a professional to do this for you, and to properly measure the panel to ensure you get the right size. You can see out full selection of storm panel retainer clips here.