Replacing old balances

A quick learner from USA says:
May 30, 2017
I would like to replace balances on my 1984 custom double hung aluminum windows. The only number on the outside of this balance is 25C BSI. Could you please let me know if you have anything that would fit, or would they have to be manufactured? I have attached pictures that I hope will be helpful. Thanks.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
June 2, 2017
This is a special type of balance that will need to be custom made. Before we begin, can you just tell me how many you need?
Channel Balance Hook
Channel Balance Hook
15-036
$0.74
Rivet, 3/32" x 5/8"
Rivet, 3/32" x 5/8"
62-005
$0.17
How to Replace a Channel Balance Attachment
How to Replace a Channel Balance Attachment
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