Unknown windows need parts

A handy person from Granby,C.T. says:
Need replacement parts for a few windows,the only number I could find was on the ballast,23B,BSl,LM
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Bob from SWISCO responded:

Thanks for writing in. This looks like a Series 751 channel balance. You'll need to remove the balance from the window to confirm it matches the specifications on the product page. Confirm the length of the metal channel--this should be 24", in which case you'd need the S751-24, with a stamp option fo 23B; but let us know if it differs. For your tilt latch, compare the dimensions to our 26-188W

S751-24 : 24
24" Series 751 Channel Balance
S751-24
$10.77
VIEW >
26-188W : White Metal Neutral Tilt Latch, 2-5/16
White Metal Neutral Tilt Latch, 2-5/16"
26-188W
$5.07
VIEW >
How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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Replace an Internal Latch with a Surface Mounted Latch [1080p]
Replace an Internal Latch with a Surface Mounted Latch [1080p]
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Anatomy of a tilt window
Anatomy of a tilt window
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