Caldwell Sash Balance

A handy person from Los Angeles, CA says:
I am trying to replace the balances on two windows. They have some faint markings that say "24-3 68(?) Caldwell". They are 5/8" deep and just slightly more than 5/8" channel width (11/16"?).
User submitted photos of a window balance.
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Tom from SWISCO responded:
You may begin by taking a look at our S390-25 channel balance with the 2430 option. Please make certain that your nylon caps match our 19-002 and 15-001 shoes that come with this balance. Get back to us and let us know if this is a good match for you.
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