Need help identifying plastic push-in window frame clip.

I have several of these window frame clips that have broken and I'd like to replace them. They are for vinyl, tilt basement windows. These clips push in but I can't seem to find them anywhere. All of the clips I've found use a screw to hold them in place and that's not what we have in our windows.

They measure 3/4" long x 5/16" wide. The main part is 1/16" thick with an additional 1/16" offset near the pin that holds them on.

Any help you can offer would be very much appreciated.

Thanks.

Tom