[villagetinker]

You might find this at White Aluminum, 441 Leesburg.
One word of caution, when you take the screen frame off the slides and before you start removing the old screen make up a jig or something to hold the screen frame in the same position, or at least measure the diagonals and record. When you install the new screening, it might cause the frame to pull out of alignment (square?) so that it will not fit or slide correctly, you want the frame to have the same alignment as when you took it off.