Thanks for posting. The roller appears to be either our 84-096 or 84-108. The difference with these two rollers involves how they clip onto the door corner. The 84-096 has a space that clips into the hook of the corner, as you can see below.
The 84-108, meanwhile, has a post that hooks into the door corner.
Assuming you have the 84-096, which I believe you likely do based on your old door corner, a replacement corner, if you need it, is possibly our 95-227A. We had your exact corner at one time, but it was discontinued not long ago, and the 95-227A is our best possible substitution. Let me know if you have further questions.