Balance box for Anderson double hung model #30310 W

A home owner from Farmingville , ny says:
Looking for balance boxes for the anderson double hung window model#30310. Part number is D73 7# 27-11-86. also has number 11600-17 on part. Can you identify this part and give us part number to purchase?
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Paul from SWISCO responded:
I think I can, yes. Based on your stamp of "7#27" I recommend our 24-737 Andersen sash balance.
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