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Please help finding right parts of Andersen balance

A home owner from morris plains says:
I have two double hung of same size. Both made on 88.
marking on windows CIG-2 2-88.

Two of the balances looks like

One has S18 1031 5-88 , 11600-17

and there other side is loose (may be its one replace before? should not be using a year 1985...)
1600R-2 and J23 5#31 10 85


The second window has S18 1031 5-88, 11600-17 marking so I think. Thanks.
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Tom from SWISCO responded:
Thanks for posting. The key stamps here are "1031" on the first balance, "5#31" on the second balance, and "1031" again on the third balance. Are these all for different windows? The way you phrase it, it sounds like the first "1031" and "5#31" are used in the same window. Am I mistaken or can you confirm?One window should have the same identifying stamp on both sides. This is an important detail to take note of.

I would recommend the 24-1033 for both "1031" balances and the 24-531 for the "5#31" balance.
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