Our original screen doors need fixing. Plastic track fills with dirt; sweep it out, or leaf-blower-it-out. These rollers are what get rusty and fail. There are two at the top and two at the bottom. The top two seem to last much longer as they don’t side in the wet and dirty bottom track.
Parts at Home Depot. Plastic wheel replacements will not rust but will not last as long.
https://www.homedepot.com/p/Prime-Line-1-in-Steel-Screen-Door-Tension-Springs-with-Steel-Roller-2-pack-B-513/100141044
https://www.homedepot.com/p/Prime-Line-1-in-Nylon-Roller-Screen-Door-Tension-Spring-B-747/202887751
Part at manufacturer website:
https://www.primelineparts.com/screen-door-tension-spring-nylon-roller-1-in-mill-2-pack/
Parts at Menards:
https://www.menards.com/main/hardware/door-window-hardware/sliding-screen-door-hardware/prime-line-reg-steel-m-spring-tension-rollers-with-plastic-ball-bearing-wheels-2-pack/b640/p-1444451453244-c-3620.htm
https://www.menards.com/main/hardware/door-window-hardware/sliding-screen-door-hardware/prime-line-reg-stainless-steel-m-spring-tension-rollers-with-1-plastic-wheels-2-pack/b747/p-1444451464654-c-3620.htm