Top sash guide has 2 square chambers

A quick learner from California says:
I tried the 18-110 sash guides but they didn't fit. Can you think of something?
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Tom from SWISCO responded:

I'm not sure. It's tough to make out precise dimensions from just a photo of a tape measure. You can start by looking at our 18-166, though. Carefully review our dimensions and let me know how they match up.

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