Replacement channel counter balance

A home owner from California says:
Ink stamped 26 4 CMC 7

Channel 1/2 wide x 1/2 deep

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Tom from SWISCO responded:

I'm afraid this information doesn't tell me what you have. That stamp isn't a product code. I see you were looking at our S385-26, though. This comes with a 19-005 top and 15-004 bottom nylon fitting. Do these match your existing nylon fittings? If so, then this is the replacement you want.

A home owner from California says:

Trying to add photos but dead end when I select "Add Photo"

The metal channel is 27" long. The nylon piece sticks extends beyond the end of the channel about 1/4 inch on the pulley side. The nylon piece on the spring end extends about 3/4 of an inch beyond the other end of the channel.

The end parts referenced are close but shapes slightly different. The dimensions are very close. But I am looking at an assembled part.

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Tom from SWISCO responded:

I'm afraid without photos, we cannot confirm what you have. I recommend watching the video below. This should clarify the important details to consider.

A home owner from California says:
Hope these help identify the part. Thank you.
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Tom from SWISCO responded:

It does indeed. Now that I see your balance, I think our S385-7 is a great option. I would just confirm that the depth of your shoe is the same as it is on ours.

Close up of the S385 balance bottom.
A home owner from California says:
It looks like mine is between 1 1/16 and 1 3/32. With my tape measure I call it a fat 1/16th. My guess is 1 3/32 will work fine. Was the picture with the tape measure enough to get the length correct? I also provide length details earlier in the thread. Thanks again. I'm planning to order 2 of these for the window.
A home owner from California says:
you wrote S385-7 for the part number. Did you mean S385-27?
A home owner from California says:
The -27 is correct.

I went to order it it makes me select an option. These are 4 digit options which I am guessing has something to do with capacity?

Suggestion for the option code I should use?

Thank you.
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Tom from SWISCO responded:

You will go with the 2640 to be used in place of your stamping of "26 4."

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