milgard window balance spring

A quick learner from 94549 says:

I need two balance springs for my milgard non tilting window. Which part should I order. How long does it take to receive the parts.

Thanks

Shan

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Bob from SWISCO responded:

See our S380-27 or S385-27. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare both with your old hardware to see what matches best. For a new stamp option choose 2640. 

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