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Bob from SWISCO responded:
June 24, 2023
Hello there. I'm sure we can help, but I need to confirm a few details before proceeding. First, can you double-check the length? Be sure to measure only the metal channel--do not include the end fittings or attachments in this measurement. I believe it should be 19". Second, do the nylon fittings or attachments at either end have 'side tabs', or what we call wings? It's admittedly a bit hard to tell from your photos. See the diagrams below for a reference about what I mean. If they do indeed have these wings, then you need either the S380-19 or S385-19. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare the second diagram below with your old hardware to see which balance Series matches best. In either case, for a stamp option choose 1850. Let me know if you have further questions or concerns. 
Close up view of the S380 balance top.
Comparison of the S380 and S385 balance shoes.
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