Attaches window to the weight springs

A handy person from Denver Colorado says:
November 11, 2020
See attached photos. Not sure what the part is called. These are vinyl windows that can be tilted out and removed. ...837 is the part out of the bottom of the spring and the part where the tab on the side of the window is inserted. ...848 is a side view. ...902 is a back view. I definitely need 2 of these and will probably buy several as this can't be the only window where this part is going to break.
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Bob from SWISCO responded:
November 16, 2020

This is called a T-Lock Shoe. How does our 15-229 match up? Take a look and see what you think. 
A handy person from Denver Colorado says:
November 16, 2020
Thanks! Got my order on Saturday and installed on Sunday. Perfect fit once I figured out how to install!
1-1/4" T-Lock Balance Shoe, Closed Cam
1-1/4" T-Lock Balance Shoe, Closed Cam
15-229
$1.97
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