Trying to identify my window channel spring.

A quick learner from Brea Ca says:
My window channel is 1/2 inch 25 inches long and has 2430 stamped on it. It it 350 or 380 model Thanks
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Casey from SWISCO responded:

Hello,

This combination of attachments would be replaced by our S350-25 channel balance with a 2430 spring strength option. Thanks for posting! 

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