Caldwell replacement window balance

A handy person from Port Ludlow, WA says:
The Caldwell channel balance is 33" long (metal only).

I would like to order two replacements.
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Bob from SWISCO responded:

Take a look at our S380-33 or S385-33. The only difference between these two balances is the bottom nylon shoe depth, so compare both with your old hardware to see what matches best. You'll need a stamp option of 3240. 

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