Channel balance help

A handy person from Seattle WA says:
I need 2 channel balances. The part is 19" metal to metal and has 1840 BSI DV imprinted on it.
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Bob from SWISCO responded:

This looks like either an S380-19 or S385-19 to me. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option, choose 1840.

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