verify channel balance

A handy person from Maple Valley says:
Hi, I think I have a 26"380 channel balance. The balance does not have a stamp option that I can find. The window size is 40"x30".
Please verify model of channel balance (380?) and recommend the stamp option.
Thanks in advance
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
This could be either the S380-26 or the S385-26. The only difference between them is the size of the shoe, which is too subtle for us to make out based on pictures. You will need to measure your shoe as carefully as you can and refer to the dimensions we show on our site to confirm the best match.
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