Patio Door Roller Assembly
The roller assembly has a nylon/plastic single wheel that is 1-1/8" diameter.
Thanks for reaching out! This patio door roller was discontinued quite some time ago, unfortunately. The good news is we have a solution I believe could work for your repairs.
We suggest reusing the existing housing and swapping out the old wheel with a new replacement. You'll need the 81-228 1-1/4" dia Nylon Concave BB Wheel and the 81-310 Roller Axle Repair Kit to complete the repair.
I'm happy to help! Here are the dimensions for the wheel so that you can compare them to confirm that this is the correct replacement. I've also included the dimensions for the 81-228 1-1/4" dia Nylon Concave BB Wheel.
Good luck with your repairs!