Old andersen window balance

A quick learner from illinois says:
October 24, 2020
I'm trying to repair an old Andersen window where the sash balancer has failed.

I've attached pictures.

It appears to me the part numbers are 11600-17.
The windows is double hung

I see a number stamped on both balancers:

1031 BS27 4-91

My right balancer is broken. The left seems to work fine.

Could you tell me the proper replacement part number.

Thanks,
Dan
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A quick learner from illinois says:
October 24, 2020
Additionally, this is the stamping on my left balancer. It's different from the right one. I need to replace this one. I may replace both so please give me both part numbers if they are different.

Thank You
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Tom from SWISCO responded:
October 29, 2020

Hello, Dan. It appears both balances have a "1031" stamp, which is the only one you need to worry about. Based on that number, you can use our 24-1033 to replace it.
Andersen Sash Balance, 1027, 1031, 1033
Andersen Sash Balance, 1027, 1031, 1033
24-1033
$54.20
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