A handy person from Seattle, Wa says:
The width measurement of the plastic strip is 5/16" with the gasket itself being 1/4"

I've included a picture of the maker and model of the windows.

User submitted photos of bubble seal.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Take a look at our 58-135 bubble seal, this may be what you want. I know it's hollow, rather than foam-filled, but both types of seal work just as well as the other.
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