This is an alluminum door from the 80s. I started taking it apart, but stopped short of removing the actual roller assebly, but you can see it in these photos. Single wheel. The door is 1 inch exactly and the wheel is 1-3/8 -see photo. In the "bottom rail" photo, I've lifted the side to expose the roller. Let me know if this provides enough detail. This is a rent house and I plan to visit again on Friday, but didn't want to dissassemble the door again if I didn't have to. (umtil it's time to swap them out for goood!)
![Door width](images/pictures/2023/04/639209.jpg)
![bottom rail](images/pictures/2023/04/639210.jpg)
![side rail view](images/pictures/2023/04/639211.jpg)
![wheel and bracket](images/pictures/2023/04/639212.jpg)
![wheel width](images/pictures/2023/04/639213.jpg)