What is this part?

A quick learner from Jacksonville, Florida says:
There are four of these on the window sash. They keep the aluminum sash from rubbing on the frame.
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Bob from SWISCO responded:

Thanks for posting. See our 67-026 to start. Compare with your old part and see if you think this will work for you.

A quick learner from Jacksonville, Florida says:
That's it. Thanks for your help.
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Bob from SWISCO responded:

No problem! Let us know how it works out.

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