Jasmine from SWISCO responded:
March 6, 2023
Thanks for reaching out! This looks like it could be the Series 377 channel balance. The top fitting looks close to the 19-018 , which is what's used with this particular balance series. The other possible top guide would be part 19-041. Although, based on your photos I do believe you have the 19-018. Take a look at the dimensions below and let me know if they differ. If they are the same, you'll need the S377-28 with a 2740 stamp.
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