Andersen double hung balance

A home owner from Pa. says:
Numbers should be visible on picture. I can't remember which windows these belongs to.
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Tom from SWISCO responded:

Hello! Looks like these are two differently calibrated balances. I know you said you don't remember what windows they go to, but can you at least confirm that they're two different sizes? I just want to be sure they're not off the same window. 

If they aren't, then we're good to go. The key numbers here are "939" for the first one and "837" for the second; with that in mind, I recommend the 24-939 and 24-837, respectively. I am very confident these will work for each type shown.

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