window balancer

A quick learner from san antonio, texas says:
these are labeled 28 30. But the channel measures end to end 28-7/8 long . so what is the correct part to order?
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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 window, including top and bottom attachments, to recommend a replacement. Thank you!

A quick learner from san antonio, texas says:
More pics of ends
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Casey from SWISCO responded:

Great! Take a look at our S370-29 channel balance with a 2830 spring strength option. 

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