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Casey from SWISCO responded:
February 26, 2020
Hello and thanks for writing in. Have a look at our S377-24 channel balance. This comes assembled with a 19-018 balance top and 15-005 bottom balance shoe. Compare your fittings with ours to see if everything looks like a good fit. If so, you can go with the 2340 option that supports a sash weight of 18-23 pounds. The "sash guides" you're referring to are just the fittings attached to the balance. Should you need to replace your guides as well, please remove one from the window and attach photos for us to see. Measurements will be needed as well. |
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Casey from SWISCO responded:
February 26, 2020
Your bottom balance shoe looks to be a little different in design, but I don't believe that should matter. As long as the dimensions match up, then you should be good to go. 
Diagram on how to choose between the 15-001, 15-002, 15-004, and 15-005 channel balance shoes.
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