Replacement door rollers
Hello,
The roller on the left in your picture looks like our 81-129 diecast roller, depending on how the dimensions on our product page compare to yours. The two on the right, I'm less sure about. I'm going to have one of our senior experts take a look and try to narrow down your options. If you could supply dimensions for the other two rollers in your photo, that will help them research a replacement for you as well. Thank you!
I believe your quickest fix for the two rollers to the right in your picture would be to use the 81-116 wheel along with the axle kit 81-310 while keeping the existing housing if it is still in decent shape.
You might be able to use one of the rollers like the 81-129, 81-023 or the 81-282, but you would need to check and see which one of these type rollers would fit in the bottom channel of your patio door rail. Take a look at the suggested parts, along with the related videos for assistance with installation. Thank you!