anderson window sash balance replacement part

A contractor from annapolis md says:
I need two replacement sash balances it says Anderson Corp, Bayport Minn and then 11600-17 on the flat body. There are faint numbers and spaces on the tab (with a staple) at one end but they differ between the two identical units I pulled out of identical windows. perhaps these are lot numbers? I think they're irrelevant but here they are anyway:
1131 1 6 9 92
927 1 0 1292
User submitted photos of an anderson balance.
Profile picture of Paul
Paul from SWISCO responded:
Check out our 24-939. This can replace Andersen balance boxes with the stamp 927.
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