Millard widow sash spring balancer?

A quick learner from Shingle springs , ca says:
Looking for two spring loaded Millard sash balance. Metal housing is 21 in long and about 1/2 in wide
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Based on your pictures, I think our S385-21 channel balance is a close match. Just confirm that the nylon attachments on either end are the same size. I would also recommend our 2040 option.
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