Looking to identify and replace rail and spring for windows

A landlord from Wauconda, IL says:
The rail is 5/9" tall and 1/2" wide (when laying down with spring side up). The rail is 34" long (which excludes the plastic pieces that extent past the end of the rail). The rail has "33300" stamped on it.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Take a look at our S385-34 channel balance, this looks to be a good match. Just make sure the bottom shoe is the same size as yours.
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