Wheels & track for patio door

It's hard to make out what you need without seeing the roller removed from the door. A lot of important details are obscured. That said, I think you might have a Capitol 920 patio door. This used the 81-007 roller. They have been out of business for some time now, so their track is no longer available. I suggest something like our 80-102 track cover. You can place this over the damaged track. See the video below for more information.

If all you need is the roller, then a clear picture of it should suffice for now. We will also need detailed measurements. I recommend using the dimensions we list for the 81-007 that Paul suggested as reference.