sliding screen door bottom guides

These are old cottage doors. No brand name found.

Missing 6 of these sliding screen door bottom guides. The aluminum extrusion measures 1/2" on the outside, about 3/8" inside extrusion dimension. About ½" deep (tall) and 2.5" min. length. Of course, the light screen door rides on a narrow single aluminum track rail that's in the center of the extrusion.

Purpose of the plastic guide is mostly to keep the aluminum from rubbing on aluminum. Smoother action. As a backup plan, I am thinking that a pair of very narrow J or U-shaped plastic guides wrapping around and gluded to the aluminum might work.