Look at your bottom shoe and measure it like the photo below. Is it 1" or 1-3/32"? A 1" shoe would mean you need S380-32 and a 1-3/32" shoe means you need S385-32. In either case, you should need a 3130 stamp option. The length can be verified by measuring the metal channel alone, and the stamp can be verified by weighing the sash and comparing it to the chart in the product description for the S385-32 or S380-32, whichever you end up choosing.
Comparison of 15-004 and 15-005
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