Series 390 channel balance

A quick learner from Maryland says:
I need to replace several channel balances that appear to be series 390 (S390-24) and are stamped with "2020". Would that have to be a special order?
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Donna from SWISCO responded:
A Series 390 channel balance stamped with 2020 will have a balance length of 21 inches, not 24 inches. Measure the length of the balance and do not include the fittings in this measurement.
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