Channel Balance Id

A handy person from Cascade, Co says:
I have a Channel Balance stamped 26 4 JO Caldwell
27" in Length 1/2" Wide
The window sash it is lifting is 33" x 30 - (heavy)
What is the part # I need to order?
User submitted image of their window hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Based on your pictures, I would recommend our S385-27 channel balance. This looks like it could be a good match. I would also recommend our 2640 option.
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