Window Balancers 31" length

A contractor from California says:
Unfortunately I'm not able to make out the numbers or letters
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Bob from SWISCO responded:

See either our S351-30 or S390-30. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option, choose 2940. 

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