Balances for single-hung tilt-in window sash

A quick learner from Fenton, MO says:
The house was built in 1989 with original balances. They are single hung with the bottom sash able to tilt in. The length is 41" and is 1/2" thick.
There is a code of 4030 imprinted toward the bottom.
Channel balance
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Tom from SWISCO responded:
We should be able to custom make this. Before we begin, can you just tell me how many you need? Once I know that, I'll email you a custom order link and price quote.
A quick learner from St. Louis says:
Would need 10-16 depending what I find when I take the windows apart. I can provide the old hooks if that would help.
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Tom from SWISCO responded:
There's no need, your pictures tell us everything we need. I'll send you a custom order link for 10. If you'd like to change it, let me know.
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