weathervane single hungup window channel balance

A home owner from seattle says:
Hi, I need to replace the channel balances for 3 single hungup windows in my house. Those are 1/2 inch wide, 25 inch long. Please check the pictures for detailed structures and recommend me the proper products that can work for the old weathervane windows. I also need to find top sash guides that match the new balances.thanks!

User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I think we can help replace this balance, but it will have to be a custom order. I'm thinking of making a 25" long balance with a 19-038 top and 15-193 bottom. Let me know if these look good. Before we can begin, I just need to know how many you need and the weight of the sash that these balances support.
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