Tom from SWISCO responded:
January 10, 2018
This is a Series 380 or Series 385 balance, I believe. Measure the bottom shoe as shown below. If you have this 1" shoe, you need a Series 380 , and if you have the 1-3/32" shoe, Series 385 is the right choice.
To choose which of the balances in that Series you need, measure the metal bar. It may be 23", but you should verify that. If so, you'd choose S380-23 or S385-23. When you try to order those parts online, you'll be prompted to choose a weight "option." There is a chart in the item product description that tells you which option to choose based on the weight of your sash. Weigh it and choose an option. 22D usually corresponds to our "2240" option, but you need to weigh to be sure. Comparison of 15-004 and 15-005
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