Milgard Channel Balance 27"

A quick learner from San Jose says:
Nylon cord snapped on both sides. Will need 2 replacements. Measures 27".

Stamp says 26 4 IW CMC 11. Pretty sure this corresponds to your S385-27 in the 2640 option but wanted to be sure.
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Lauren from SWISCO responded:

Hello, thank you for posting! 

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 will need a 27" balance with a 2640 stamp option. Please let me know if you have any questions. 

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