Window channel balance

A quick learner from California says:
Looking for replacement window balance. It has markings 26 4 GX CMC 7, please tell me what is the correct top and bottom guide so I can order the right replacement.

Thank you!!!

This whole thing is 27 inches from metal to metal.
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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 stamp option of 2640. 

Swisco.com
Please let me know if you have any questions! 
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