Paul from SWISCO responded:
January 17, 2017
Thanks for posting. Compare our 18-157 Gapco top sash guide to the one in your picture. It appears to be the closest match we have.
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Paul from SWISCO responded:
January 23, 2017
I think you should be okay. The 18-157 I recommended is designed to work with balances like our Series 390 (and specifically top guides like the 19-002).
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