I see some large gaps there. You might be better off with some bricks & mortar.
The best I can recommend unless someone can positively ID it and provide a source I'd suggest you contact AAA Screen. They carry the complete PrimeLine catalog (probably the largest maker of window and door parts around). They have the catalog on their website...but I didn't see a match. I have had very good experiences emailing them pictures of items. You'll need to get one out and clean it up and take some pics. Measurements are always helpful. There may be a replacement that doesn't look quite the same but will function. No markings or labels on any of the windows? I see you are in Canada, not sure if they can ship there, but maybe you have a US friend that could help?
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