Tom from SWISCO responded:
July 13, 2017
Hello! This top sash guide actually isn't made anymore, but I believe you can use our 18-171 to replace it. The only difference, which is plainly evident as soon as you look at it, is that the 18-171 is taller at the top. You would have to trim this off with a hacksaw to get it to fit in your sash, but once you do that you should be good to go.
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