Replacement window screen

[Blackrock]

I have lost the window screen from the escape window in the bedroom. This is the type where you unlatch a metal flat strap and the push the window out for ventilation
I guess we didn't pull the window back in when we left camp and the wind popped the screen out and it's gone.
Any ideas on where to start looking for a replacement.

[JRTJH]

You can try this link to Trekwood to start: http://www.trekwood.com/products/580005/Screen-Window-Replacement-All-Sizes-Kinro

[Blackrock]

Checked it out and looks like they might have what I need. Thanks.

[OhioRVDude]

I need the exact same screen, but they are asking for the window part number. Any idea how I can find that?