Window channel balance

A quick learner from Fallbrook, California says:
26 4 DR Caldwell

27 inches long

Sash weighs 17 pounds

I believe that I need your part S385-26 Option 2530

Do you concur?
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Casey from SWISCO responded:

With this combination of attachments, you could have either an S380-27 or S385-27 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. 

Based on your balance stamp, you'll also need 2640 spring strength options for your replacement balances but keep in mind that this strength option is for a sash between 19 and 26 lbs. If you're sure that your sash weight is exactly 17 pounds, you should go with the 2630 option for your balances. 

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

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