Window parts

A quick learner from Florida says:
I have 7 windows I need balancers for. Five of the windows have a stamp number of 2940 (BSI) on the aluminum rail and are 30" long and 1/2" wide. One has a stamped number of 1730 and is 18" long and 1/2" wide. The last one has a printed number of 29 9 FS CALDWELL and is 30" long and 1/2" wide. I attached some photos of the ends to help identify them.
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Casey from SWISCO responded:

Hello,

With this combination of attachments, you could have either an S380 or S385 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. You'll also need 1730 and 2940 strength options for the two different balance lengths you're window have. 

Thank you and let us know if you have any other questions or concerns.



1
58-134 : Commercial Bubble Weatherstrip, 25ft
Commercial Bubble Weatherstrip, 25ft
58-134
$20.32
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S380-18 : 18
18" Series 380 Channel Balance
S380-18
$8.98
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S380-30 : 30
30" Series 380 Channel Balance
S380-30
$10.87
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58-135 : 25ft Bubble Seal, 3/16
25ft Bubble Seal, 3/16" x 3/8"
58-135
$15.15
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15-029 : Winged Channel Balance Shoe, 7/8
Winged Channel Balance Shoe, 7/8" Depth
15-029
$0.81
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