Need replacement Anderson balance

A contractor from Massachusetts says:
September 11, 2017
I gathered the following numbers on the windows I need replacement parts for.
D79 7#27597 for one window ( both sides)

BC5 6#31287 for 2 windows (both sides)

C42 6#31687 for one window (both sides)
Let me know what to order.
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Tom from SWISCO responded:
September 11, 2017
Your 7#27 Andersen balance corresponds to a SWISCO 24-737, and both of your 6#31 balances can be replaced by our 24-637. Let me know if you have more questions.
Andersen Sash Balance, 725, 727, 731, 737
Andersen Sash Balance, 725, 727, 731, 737
24-737
$54.20
Andersen Sash Balance, 623, 627, 631, 637
Andersen Sash Balance, 623, 627, 631, 637
24-637
$54.20
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