Also I am looking for a lower sliding door wheel if anyone has one? I bought a new one from schofields but I think its to big, as I could not get the door back on! the wheel I bought was 23mm, i'm thinking that I need a 20mm one, as that's the size of the wheel that's on the top bracket.
That's great sorry about the delay, I don't have any pictures as my camera is broke. Any chance you could post a picture of the one you have and I will let you know if its the same.