Paul from SWISCO responded:
November 11, 2014
The hardware you're looking to replace are called "top sash guides." In order to identify what you have, I will need you to remove a top sash guide and show me a few pictures of it by itself. I will also need detailed dimensions. Check out the video below to see how you can remove the sash. Once the sash is removed, you can simply unscrew the top sash guide.
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Tom from SWISCO responded:
November 14, 2014
It's hard to tell what your dimensions are with just a tape measurer, but look at our 18-166 and see how well its size matches yours.
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