What is this part called?

A home owner from California, USA says:
Hi.

This is the mechanism that connects to the arm on each side. It slides onto the bottom of window and is secured from sliding off with a screw. I couldn't find any markings or branding on the other parts either.
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Tom from SWISCO responded:

This appears to be a guide shoe for a casement or awning window operator. We actually sold this exact part at one time, but it was discontinued and is no longer available by itself. At this time we only sell one operator that still has it attached, which is our 39-312

Dimensions for 39-312
Dimensions for 39-312

How to identify casement and awning operators
How to identify casement and awning operators
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