please help identify which channel I need.

A home owner from 77430 says:
March 2, 2022
My rail is 27 inches in length. It has these markings: "26 4 FX CMC 11".
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Bob from SWISCO responded:
March 3, 2022

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.
27" Series 380 Channel Balance
27" Series 380 Channel Balance
S380-27
$10.55
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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