This balance is going to be an S380-28 or an S385-28 channel balance. I can't tell by looking; you have to measure. The 1" shoe below would mean you have Series 380, whereas the Series 385 has a 1-3/32" shoe. You can consider the 2730 option, but you need to weigh your window sash to be sure. It will weigh 13 to 19 pounds, if your option is correct.
Comparison of 15-004 and 15-005
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