WW Milgard Balance Springs replacment

A home owner from Chico , CA says:
One of the balance springs failed on a Milgard window.

12 inches long

Number on metal: 11 2 FP Caldwell
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Bob from SWISCO responded:

Hello there. This looks like either an S380-12 or S385-12 Channel Balance. 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 stamp option choose 1120.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

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