Anderson double hung window balancer replacement

A quick learner from Pittsburgh says:
Can you please identify this Swissco equivalent replacement balancer.
Part is 3" wide by 6-5/16 long, with a 1/2" long mounting tab.
Each Window sash is 24" wide x 32" long.
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Casey from SWISCO responded:

Hello,

The 7#31 stamp shown in your photo indicates that you would need the 24-737 Andersen sash balance for your repair. Take a look and let us know if you need anything else. Thank you! 

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