Replacement Balances Estimate please

A quick learner from Camas, WA says:
Hello, I would like to order two window balances.
Window slides Up and down only. (No tilt)
Metal length measures 26 inches, width 11/16 inch (approximately)
Metal length with plastic ends measures 27 1/8 inch

Channel has rolled pressed edge ( see pictures)
Has the following markings printed on it: 25 4( could be an A) Caldwell LM

Window (I believe it's called the sash) weighs 18.7 pounds

Please let me know if you need any other additional information.

Thank you for your assistance,
Liz





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Emily from SWISCO responded:

Hi, Liz.

Thank you for your patience during our busy season. With this combination of attachments, you could have either an S380-26 or S385-26 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. If your sash weighs exactly 18.7 pounds, you'll need the 2530 stamp option. This is for a sash weighing 15 to 19 lbs. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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