screens for curved glass windows

[PatriciaOH]

I have a ca 1880s house with three curved (or "bowed?) windows on the second floor. i'd like to find window screens that are similarly curved or flexible enough to fit into what are the grooves/ tracks on the bottom of the window ledge; once up a time, there must have been screens for these windows. I've been using the adjustable screens you get at Home Depot, etc (sort we used in my childhood) but they're a bad fit, as I have to ram them in and lower window onto to them. I've googled to no avail. Lovely windows but I need the air minus the moths and the occasional bat that finds its way in when I simply go without screen.

Any leads appreciated. Thanks.