Allsco window. Channel balance needed

A handy person from Kittery ME says:
The balance is 25"L x 5/8" D x 9/16 W. II need to replace many of these and this was the only name that came up in the search. Please let me know if there are other options. Thank you
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
It's difficult to tell exactly what you have, but see our S770-25 to start out and let me know if this would be a good match.
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