What roller do I need for my Guardian door?

I'm sorry to say that this label doesn't tell me anything about the rollers used on your door. This is only relevant to the glass, which isn't made by the same company who made the door.

The bad news is that there isn't any label, marking, or code that will easily tell you what kind of roller you need. There is only one way to properly identify that part and that is by removing the original for reference.

I know that's not what you wanted to hear, but this is the only option available to you. I wish there was an easier way, but you should brace yourself now for a significant investment of time and energy. This project will require removing the door twice, at minimum: once to identify the rollers, and a second time to replace them. You'll also need at least two pairs of hands to be safe, and several hours of free time. This is the bare minimum of what's required. 

Once the roller is removed, you can take photos of it and submit them here for me to review. I specifically need to see the back end, top, and sides. You'll also need to measure the housing and write out what you get, so that you have something concrete to compare to any potential replacement options.

Once I have that data, I'll do my best to track down something that would be compatible.