Window Channel balance

A contractor says:
I think I found the parts, but i don't see the window channel balance for it ...

Think its Top Fitting Weathervane 19-038 and Bottom fitting Weathervane 15-193 , it has 2430 BSI stamped on it the metal part is 25 x 1/2 x 3/4 inches long...
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Bob from SWISCO responded:

Thanks for bearing with us. We'd be happy to replace these balances with Weathervane attachments, but it will have to be a custom order. I just shot you an email with a custom link to order a pair of 25" balances, stamped 2430, with the 19-038 Top and 15-193 Bottom attached. If you need a different amount or have any other questions, just let me know. 

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