Window Block and Tackle Sash Balance

A quick learner says:
I need a replacement for 2 windows that have a broken block and tackle sash balance. They are from Norco windows that are approximately 25+ years old. One measures 17" in length and has the number 16 stamped on it. The other is 25" in length and has the number 24 stamped on it. Those are the only stamped numbers on the metal block and tackle. Please let me know if you have any additional questions or need pictures of something specific.
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A quick learner from Grand Rapids, MI says:
The part that broke on the 17" length one is in one of the pictures.
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Paul from SWISCO responded:

Your balance shows some resemblances to our Series 751 channel balance. But to be 100% sure this is the correct balance for you, you're going to want to compare an undamaged version of yours with ours. Get back to us and let us know if this is the balance you have been looking for.

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