Roller size is 1-1/8"
Is this something you can provide?

Hello there. The original poster showed just the inner assembly of a roller. The outer housing was likely still lodged in the door. The width would no doubt have been thicker if they measured the whole assembly. If you're looking at a roller similar to what the original poster shows, then chances are you also are missing the outer housing and should check to see if it's still in the door. Then, see how the whole assembly compares to the 81-090 shown below.