Anderson Window Sash Balance

A home owner from Biddeford, Maine says:
I need to replace the sash balances. See photos of the sash balance front and back.

The window is 29.5inch wide. The frame is 32 inches wide. The inside dimension of the frame is 31.5. The height is 53.5 in.

Please clarify your part number.

Regards, Mark
User submitted photos of an Andersen window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, and for the pictures. Based on the numbers stamped on your balance, I recommend our 24-837.
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