Vinyl window part

A quick learner from Saginaw, MI says:
There is one of these on each side of the window track. The plastic covering is breaking apart and there is a circular spring inside it.
User submitted a photo of window hardware.
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Paul from SWISCO responded:
If your coils are 3/8" wide, and if you have two of them behind the covering, you could consider our 15-204 support.
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