Window ballast

A home owner from LYONS GA says:
The metal channel is 34 in. The spring is 20 in. The overall window is 35 in wide 71 in tall the metal channel has 34C BSI stamped on the back side I need two of these if you could help me figure out what I need thank you for your time.
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Tom from SWISCO responded:

Based on your photos and information, I recommend our S775-34 channel balance. Look it over and let me know what you think.

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