Andersen sash balancer

A home owner from NY says:
May 24, 2021
Hi.

Both balancers bear a code we read as
D27 7#31 6 81

No left, no right, no stamp on tangs.

If you have any suggestions for replacement, it would be much appreciated.
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Bob from SWISCO responded:
May 27, 2021

See our 24-737. This is meant to replace Andersen balances that include the stamp 731, or 7#31. 
A quick learner from WI says:
May 31, 2021
Witch balancer do I need
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Bob from SWISCO responded:
June 1, 2021

See our 24-637. This is meant to replace Andersen balances that include the stamp 623, or 6#23. 
Andersen Sash Balance, 725, 727, 731, 737
Andersen Sash Balance, 725, 727, 731, 737
24-737
$54.20
Andersen Sash Balance, 623, 627, 631, 637
Andersen Sash Balance, 623, 627, 631, 637
24-637
$54.20
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