These clips are on an American Jewel vinyl replacement window series # 1100 to prevent the windows from being opened when they are in the vent position. I've located all the other parts for these windows on your site except for these clips.
I am a retired structural and ornamental steel fabricator.
Casey from SWISCO responded:
January 24, 2017
Good morning! Thanks for contacting us. Just eyeballing it, I think you could consider our 26-338. I would just compare our measurements to yours to make sure it will fit into the window cut out.
