Difference beteween pivot lock shoes?

A home owner from Harrisburg, PA says:
What is the difference between the 15-119 and the 15-120 window pivot gears?
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Paul Sr. from SWISCO responded:
All the measurements between the two pivot lock shoes are the same except for the thickness. The 15-119 pivot lock shoe has a 3/4" thickness while the 15-120 pivot lock shoe has a 13/16" thickness.
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