Anderson Balances

A quick learner from Owings, MD says:
I have several Anderson windows and need to replace balances: The information stamped on the first window is 8 757. The daylight measurements of the window is 32 38 x 15 7/8, 3/8" Thick.

The only information I can see on the other balances is:
75 31

The daylight measurements on this unit is 20 3/8 x 23 7/8, 3/8" Thick

Can you help me identify which balances I need?

Thank you.
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Paul from SWISCO responded:
Thanks for posting. For the 32-3/8 x 15 7/8, 3/8" sash, you will need our 24-837 and for the 20-3/8 X 237/8, 3/8 sash I recommend the 24-737.
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