Channel Balance ID

A quick learner from Montana says:
27" which part number of yours do I need ? photo shows 26 3 bsi rp I also shot a picture of the lower part of the window .
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Bob from SWISCO responded:

See our S380-27 or S385-27. The only difference between these two channel 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. For a new stamp option choose 2630. 

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