Help with Missing Weatherstripping

I am trying to find a piece of galvanized steel weatherstripping that is missing from one of the casement windows in the dining room. Not sure why it was removed, but you can see daylight through the bottom of the window where it is missing. The window itself has a strip of bronze weatherstripping which locks under a steel flange the comes up a little more than a quarter inch. The back of the weatherstripping is a vertical steel piece that extends up about 1/2 inch and fits against the front of the window. Any thoughts on where I could find a replacement for such a thing? I check all the easy options (Ace, Menard's, Home Depot, etc) with absolutely no luck.

With weatherstripping

Without