Sliding Glass Door Roller

Can you determine from the attached photos what replacement roller assembly I should order?
I had another photo of the roller size but I reached your upload limit. Looks to be 1 1/4 inch, maybe a little bit bigger.
It's a vinyl slider, made by Kasson and Keller. I cleaned up the existing rollers and they seem to be working fine but since I went through all the effort I better get new ones.
Thanks.
Bo