Top Sash Guide

A quick learner from California says:
white sash cam
Length: 1-3/4 inch
top width: 3/8 inch
bottom width: 5/8 inch
has two holes
Thumbnail of the uploaded file named sash cam bottom width.jpg
Thumbnail of the uploaded file named sash cam top width.jpg
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Bob from SWISCO responded:

This looks like an 18-171, but with a smaller head. If the other dimensions seem to match, we recommend cutting off part of the head to make up the difference. Let me know what you think. 

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