Need roller
It's unfortunately not possible to identify rollers like this while they're still installed. Our service requires clear photos of the hardware in question without obstruction.
Given that this is an old aluminum door, you will likely need to knock the bottom rail off to access the rollers. This can be done by unscrewing the bottom rail, then using a mallet and block of wood to gently tap it off. Just be careful when you do this as there is a risk of damaging the glass if you aren't careful. If you aren't familiar with this kind of a project then you may want to consider having a professional do it for you.
Once the rollers are out, show us a clear photo of the back end, top, and side. You will also need to carefully measure it and write down all dimensions for reference later.