window balance

A quick learner from Arizona says:
window wieghs 15.5 lbs. The old one is 27 inch long not including end pecies. Im looking to replacement part number. Thank for any help. old stilye # is 26-9 DA2 cMC 4
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Emily from SWISCO responded:

Hi there!

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. If your sash weight is 15.5 pounds, you'll need the 2630 spring strength option for a sash weighing 13 to 19 pounds.

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