A home owner from Fort Myers, FL

A home owner from Fort Myers, FL says:
I have a window need new channel balance. It labeled as 28C.
I am guessing the proper channel is S380-29, and that based on weight I should get a set of Option 2830. However, the S385-29 seems also fit, I am not sure whether I should go with S380 or S385, what is the difference between two?Please see pictures.

Thank you.

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hello again, Yinghong! The difference between the Series 380 and Series 385 is the size of the bottom shoe; specifically, the depth. The Series 380 comes with the 15-005, which is 1" deep, while the Series 385 comes with the 15-004, which is 1-3/32" deep. Eyeballing yours, I think it may be the Series 380 but I would recommend measuring your shoe just to be sure.
A home owner says:
Hi Tom,
I measured the shoe, and it is 1" deep, so it is Series 380.
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