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what is the difference between the 380 and 390 series

A home owner from Orlando, FL says:
What is the difference between the 380 and 390 series channel balances? I need to replace my 30" channel sash (2930 code) and I can't tell which one is the correct one...
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Donna from SWISCO responded:
The series 390 has 15-001 shoe and 19-002 top attached and the series 380 has 15-005 shoe and 19-005 shoe.
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