Identifying this 3/8" wide Balance

A quick learner from North carolina says:
December 19, 2018

The metal rail measures 25 inches. The trail is 3/8" wide.

Numbers printed on the rail are: 8 240X

I need to find replacements like this one and not sure which one to order. I was looking at the 800 series but not certain.

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Bob from SWISCO responded:
December 20, 2018

Thanks for contacting SWISCO. This looks a lot like our S800-25 Channel Balance; but the stamp number is a little weird. This number should correspond to the weight the balance is meant to support. Could you weigh your window sash? A precise weight will help us identify what you might need. Thanks.
25" Series 800 Channel Balance
25" Series 800 Channel Balance
S800-25
$30.44
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