Items have numbers on them 31878 and 31879. They are a clip assembly that connects the opening hinge assembly to the base of the opening section of the window. The window is a Millgard Awning style vinyl window purchased in 2007 or 2008.
Bob from SWISCO responded:
May 5, 2020
Thanks for posting. See our 39-536 and 39-558. See if these are the parts you need.