What kind of door do we have?
Your photos don't tell me much about the door manufacturer, unfortunately. The only thing for sure that I can tell you is that it appears to use generic replacement hardware, so even if we knew the manufacturer it probably wouldn't help too much.
The handle set, for example, can likely be replaced by our 82-089. Look this over and let me know if you agree. The style seems very similar so I feel confident it will work but it always helps to double check.
For the rollers, we need to see them out of the door entirely. Specifically, we need to see the back end, top, and side. I also need you to tell me its dimensions. I know this isn't welcome news, but there's no way to avoid it. If you want to replace those rollers, you have to take them out ahead of time to ID them. There aren't any shortcuts for that.