Andersen balance replacement E60 9# 31

A home owner from USA says:
I need to replace a few balances #11600-17. The date appears to be 5/87. There is another #' E60 9# 31. I didn't see them in your list of parts, do you have these?
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Tom from SWISCO responded:
Thanks for posting. Please see our 24-939 balance. This replaces Andersen balance boxes stamped with "9#31."
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