PATIO SCREEN DOOR REPLACEMENT ROLLERS

I need a pair of lower screen door rollers similar to photos above and enclosed diagram (with measurements). One side of the roller has a PAT NO 38,879,893 but no manufacturer's name is visible on the door. Photo of Roller #1 shows a screw on the upper mechanism which is used to fasten it to the outside of the door frame. I do not care of the roller is metal or plastic as long as it has a concave groove for the track.