Glass beads for 1990 era Sun dbl hung window

A home owner from TN says:
I am looking for the bead shown above or a workable substitute
Thumbnail of the uploaded file named 20190508_102345.jpg
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Tom from SWISCO responded:

It's hard to tell what kind of glazing this is from your photo. Has any portion of the glazing ripped off? I feel like there should be more to this. If so, could we see a photo of an undamaged sample? That would help us find a good match.

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