Black shoe for track of casement window

A quick learner from Seattle says:
Hi there, I am having trouble assessing my next steps as I attempt to repair my casement window. The mechanism to the right is the original and was "slipping" as I attempted to close it. So I ordered the single arm to the right. However I can figure out how to either find a replacement or remove the original and re-install the black shoe for the window track. It says "Truth" and "29" on one side and USA on the other. Any guidance is much appreciated. Thank you.
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Emily from SWISCO responded:

Hi there!

I see that you ordered our 39-450 operator. This operator is designed to work with the 39-529 track slider and 39-528 track, not the original black slider in your pictures. Look these over and see what you think. 

Anatomy of a casement window
Anatomy of a casement window
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