Milgard window 2005, balance marked 17 5 CX CMC 11

A quick learner says:
Need a window non tilt block and tacle channel balance. The metal part is 18 inches long, nine sixtenth inches deep and nine 16 inches wide. The window was made by Milgard, half round top with a non-tilt window at the bottom.
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Tom from SWISCO responded:

Hi there! We can definitely supply this balance. I am confident that you have either our S380-18 or S385-18. The only difference between these two balance assemblies is the depth of the bottom shoe; the S380-18 has a shoe depth of 1" while the S385-18 has a shoe depth of 1-3/32".

To measure the depth, stand the balance straight up, same as it would look while installed. Then measure the "heel to toe" of the bottom shoe. 

Please let me know if you have any questions.

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