non tilt window sash balance

A quick learner from California says:
it was marked in the sash balance. CADWELL 2130
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Bob from SWISCO responded:

See our S351-22 or S390-22 . 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 2130. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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