A friend from florida says:
is rail 1/2 inches ,36 inches long
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Casey from SWISCO responded:

With this combination of attachments, you could have either an S380-35 or S385-35 channel balance. When measuring the length of the balance, make sure to only include the metal channel and not the end attachments. 

You’ll also need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight.

Thank you and let us know if you have any other questions or concerns.

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