Window channel

A quick learner from Baltimore says:
March 6, 2019
Body is 27" long
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Bob from SWISCO responded:
March 7, 2019

Thanks for posting. See our S385-27. You will need to select a stamp option. Look for a stamp code on your metal channel that conforms to one of the stamp options listed on the product page. You can also weigh your window sash, and match that precise weight with one of the weight ranges listed with each stamp option. 
A quick learner from Baltimore says:
March 22, 2019
It is marked with 26 4 CALDWELL. Is that your s2640?
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Bob from SWISCO responded:
March 22, 2019

Yes, it is.
27" Series 380 Channel Balance
27" Series 380 Channel Balance
S380-27
$10.55
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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