Building a better slider

A distributor from Canada says:

We are in the midst of developing a new slider window. We received some sample rollers from you (Part# 87-058), but we believe the housing we used came from elsewhere. I went to your website and noticed the acorn sliding window 9/16
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Tom from SWISCO responded:
I'm sorry, but your question was cut off. Could you supply us with more information? If you need help finding a replacement for your roller and roller housing, please send us a picture of the housing removed from the window. That will help us find a good match.
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