Andersen Balance 6#23

A contractor from Maryland says:
Hello. Not a first time I'm replacing ballast, - but every time I'm having issue to find a right one .
Now I've got Andersen Ballast C35 6#23 5-77 . Any ideas
about replacement? Thank you Regards JS.
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting, JS. I recommend that you take a look at our 24-637 Andersen Sash Balance. This can replace balance boxes with the stamp 6#23.
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