Window replacement parts

A home owner from Jacksonville, FL says:
Good morning,

I purchased a house built in 1981 and some of the windows open but don't stay up,
can you please help me to identify the gadget that keeps the window up?
Also, I need the little black thing that is on top of the window that keeps it
secure so it doesn't fall.

Thank you for your assistance,

Profile picture of Paul
Paul from SWISCO responded:
Hey, Clara. Looks like your pivot shoe has broken. Would you be able to show us an undamaged pivot shoe out of the window? Can you also tell me its width and thickness? Finally, please also show me a picture of the little black thing you mentioned, I'm not sure what it could be.
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