Casey from SWISCO responded:
February 25, 2020
Please have a close look at our Series 380 and Series 385 channel balances. Depending on the 'depth' measurement of your bottom balance shoe will determine which of the two balances would work. For the one that is 16", see our S380-16 and S385-16. Whichever one chosen will go with a 1520 option that supports a sash weight of 6-10 pounds. The balance that is 22" in length, see our S380-22 and S385-22. Whichever one chosen will go with the 2120 option that holds a sash weight of 8-12 pounds. Alternate view of 15-004
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