Andersen Balance replacement

A home owner from Manteo, NC says:
There are three #'s stamped on the balance. 11600-3; 11600-17; D9 7#27 4 84. Dimensions are 3 x 6.25 x 5/8 . Probably manufactured in 1984.

What replacement part do I need to order?

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Paul from SWISCO responded:
Thanks for posting, Joey. The stamp we want here is 7#27. I recommend our 24-737, which can replace Andersen boxes with this mark.
A landlord from Easton, MA says:
are there separate units for left and right>
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Tom from SWISCO responded:
Not for the 24-737, no. It can work on both sides.
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