Sliding Glass Door Roller Assembly

I'm sorry to say that I don't recognize this roller. Would it be at all possible to see a side view? Would you also happen to know who manufactured the door?

Thank you! These photos are very helpful. The bad news is that we don't sell a roller that matches this precisely. Of all the parts in our inventory, there's only one that comes close, but it's still not a sure thing. See our 81-022. 

I think this is at least a reasonable place to start, but it's not a guarantee that it will work. Look over its specs and see what you think. Ultimately you will need to determine if you think it's worth taking a risk on or not.

Alternate image for 81-022