Traco Pivot Shoe

A handy person from Pittsburgh says:
I measured (many times) the Traco pivot shoe with a precision caliper and I think that the 15-121 is the closest fit in size. I am replacing the spiral tilt window balancers with S600-22. I also considered the 15-173 since it looks similar to mine but the width is too short (31/32"). I also considered 15-015 and others that were close. The windows are at least 30 years old.

Can you offer any help before I order?

Thank you.
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Tom from SWISCO responded:

I've seen this old pivot shoe a few times in the past. In my experience, our 15-051 was the best match we could find. I highly recommend measuring an undamaged version of your shoe, either from the other side of the window or from an identical window in the house. If it's 17/32: thick, then the 15-015 is what you want.

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