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Tom from SWISCO responded:
August 18, 2017
Hi, Dave. Let's hop to it. To begin, this is a 27" balance (verify that, though), and when you go to select your "stamp option" you need to select 2640. However, check your sash weight. A 26 4 stamp usually indicates a weight between 19 and 26. If your sash weighs more than that, let us know.
The final part to the identification is the Series. You're dealing with either the Series 385 or the Series 380. The difference between the two lies in the shoe. Measure as shown below, and select a Series 380 if it measures 1", and Series 385 if it measures 1-3/32", as shown below. If you'd like us to identify any further parts like a vent stop, send photos of each part. 
Comparison of the S380 and S385 balance shoes.
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Paul from SWISCO responded:
August 25, 2017
Unfortunately, we don't have this exact window stop. We do have the 55-043, which is 1" at the top and 1-1/4" at the flare end. The depth is 13/16" and the length is 4", but it can be cut down with a hacksaw for a clean cut.
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Tom from SWISCO responded:
August 25, 2017
Awesome, I'm glad you were able to determine the balance you needed! As for these sash stops, I'm afraid we are not able to replace them. These are made specific to the window manufacturer, and you would only be able to get them directly from that source. I apologize for the inconvenience.
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