.620 backing felt weatherstrip

A professional from USA says:
5/8 backing. This slides into a channel between the two sashes at the interlock as an air dam. It's a very stiff backing, most likely sold in strips as opposed to rolls. See attached photos.

Client is looking for 300
User submitted photo of their weatherseal.
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Paul from SWISCO responded:
Thanks for posting. This is pretty big. The closest pile we have to your dimensions is our 58-050, which has a 7/16" base. Could this work on your window?
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