Paul from SWISCO responded:
October 10, 2019
Thank you for your inquiry. Take a look at both our S380-29 and S385-29 channel balances. The only difference between these two pieces is the depth measurement of the bottom balance shoe. For the Series 380, the depth measurement of the bottom shoe is 1" and for the Series 385, the depth is 1-3/32". Measure the depth of your bottom shoe, like in the diagram below, to determine the best match. Whichever one chosen will go with the 2840. Alternate view of 15-004
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