23 4 JS CALDWELL Window balances

A quick learner from New Mexico, USA says:
Length of the metal is 24" writing says 23 4 JS CALDWELL
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Emily from SWISCO responded:

Hello there!

Depending on the depth of your balance's bottom shoe, see our S351-24 or S390-24 . You'll notice the Series 351 comes attached with a 1" deep shoe, while the Series 390 comes attached with a 1-1/8" deep shoe. Take a look at the diagram below to determine the best match. You'll also need the 2340 strength option for your replacements. 

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