Rain strip for 1998 Pella casement windows

A handy person from Brecksville, OH says:
Hi,
These strips are hardening, curling up and detaching from the slots at the bottom of my 1998 Pella casement windows. The "folded over" part inserts into the channel in the window. They are 9/16" wide. Any idea about replacement part?
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Tom from SWISCO responded:

Hello! We don't sell this exact style, but I wonder if your strip could be an older version of our 58-178 . Look this over and see what you think!

Profile view of 58-178
Profile view of 58-178
Identifying Replacement Weatherstripping
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