Replacement channel balance

A quick learner from South Carolina says:
Hello, I need help in finding the correct replacement for channel balance in non tilt type window. The channel balance measures 32 inchs long and only marking I can see looks to me as 3030. I believe my windows were made in the in 1985-1998 time period. Photos are attached.
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Casey from SWISCO responded:

Hello,

We'd be happy to help but we would need to see an undamaged balance removed from the other side or another window in the house. 

I would also recommend double-checking the length to make sure you are only including the metal channel in your measurement and not the end attachments. In most cases, a balance stamped with 3030 would have a 31" long metal channel. Thank you!

A quick learner from South Carolina says:
Sorry, the correct length is 31. Pictures of the undamaged channel balance from other side are attached
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Paul from SWISCO responded:

We recommend the S371-31 channel balance with a 3030 spring strength option to replace your Rollyson assemblies. Take a look and thanks for posting. 

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