Lower sash bottom seal

A home owner from Clarence NY says:
Patriot windows installed 1999
Bubble seal 5/16"
Tee slot 3/16
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Bob from SWISCO responded:

We don't have an exact match for this bubble seal, but see our 58-135. Though this is a hollow seal, typically that difference doesn't really affect a weatherseal's performance. Compare the dimensions below with your old hardware and see what you think. 

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Profile view of 58-135
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