Repairing a jalousie window 'fin'?

I have been working on the Compact's windows on the workbench as the weather worsens here in Northern New Mexico -- they are predicting 55+ winds and possibly freezing rain by tomorrow night . . Two of the fins on the window have lost their tips. I looked at mobiltec's site but I didn't see a video of this. Can anyone offer advice? Where do I go to find a similar material to fabricate a new hooky-bit? Is this something I then try and rivet in place? I do have a hand riveter. . . or do I take it to an artist-welder? Any advice would be much appreciated.

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