These plastic shoes are attached to the window itself.

A quick learner from Florida says:
These plastic shoes are attached to the window itself. 5/8" wide by 1 1/2" long. The top flat portion that catches the channel balance is broken off.
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Emily from SWISCO responded:

Hi there!

Start by taking a look at our 18-166 top sash guide and compare our dimensions to yours to see if this matches what you need.

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