Anderson Double-Hung Sash Balance Identification

A home owner from Ithaca, NY says:
What is the replacement part number for an Anderson wood double-hung (approximately 24 x 48) window. The house was built in the early 60's. What appears to be a date code on this balance shown in the picture is 6-31-1952.

Size is 2 7/8 wide, 6 5/16 long and 3/4 inches high

User submitted a photo of an Andersen window balance.
Profile picture of Tom
Tom from SWISCO responded:
I can just faintly make out the stamp 631, which corresponds to our 24-637. however, I also notice your balance doesn't have a tab, while modern Andersen balances all do. You will have to cut out space in your frame to accept the tab on the new balance.
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