Plastic corners window screens

I believe the channels are about 5/8"x 5/16". the full corners are about 1 and 1/8" . You can see the the corner edge of each of these are broken. Looking for the correct replacements. Thanks

I need corner pieces both with and without pull tabs. You can see from the picture of a screen with the corner piece in it that the piece I took out from a screen has the edges that extend out broken off. Even the one in the screen has a piece broken off at the corner.