anderson sash balance

A quick learner from N.J. says:
My sash balance is marked 11600-2, I don't see a replacement part. These windows were made in 1981. The top sash is 20in., bottom sash is 19in. The cord is approx. 25in. Can you please help?

I found another number - "J70 5423 9-81"

The sash is about 27 7/8in. wide. The previous measurements of 20in. and 19in. were up and down.

Thanks, Steve
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Tom from SWISCO responded:
Thank you for posting. It's hard to say. I think the key number here is the "5423," but can you confirm that that's what it reads? Could that "4" be a different size than the other three numbers? I think it might be. If so, consider our 24-531. This can replace balance boxes with the stamp 5 23.
A quick learner from nj says:
Yes, you are right the "4" is slightly different.

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