Part for sliding door

In all the years I have been working on patio doors I have never seen a roller like the one in your photos. That said, we may be able to offer a replacement. Take a look at the 81-275 roller, which has a cutout at the top. It's a similar design to your old one. Compare the dimensions, especially the width and height of the assembly as well as the wheel diameter, and see if this matches what you need. Another roller which I have used in the past is the 81-023. Again, compare the dimensions and see what you think. A final possibility would be to just replace the wheel and axle with one of the kits listed on this page; if your roller's housing is undamaged, this is a viable solution. Take a look at all the suggestions from the web site along the related information and videos.