please help identify which channel I need.

A home owner from 77430 says:
My rail is 27 inches in length. It has these markings: "26 4 FX CMC 11".
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Bob from SWISCO responded:

This seems to be either an S380-27 or S385-27 . The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option choose 2640. 

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