Milgard Up/Down Slide window balancer

A home owner from San Jose, CA says:
Metal channel is 27" long.
Has marking : 26 4 DX CMC 11

I am trying to replace this part on both sides in a window. One side string is broken, and on other side the spring has issue.

Please Help.
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Bob from SWISCO responded:

See either our S380-27 or S385-27. The only difference between these two balances is the depth of the bottom nylon shoe, or 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. You will need a stamp option of 2640. 

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