Patio Roller Identification

Thanks for reaching out to us. I'm afraid I don't recognize this roller at first glance. Please allow us to look further into this. We will reach out as soon as we have more information. 

Take a look at the 81-041 and 81-260 rollers which look similar to yours, but they do not have that "jagged" edge at the bottom of the housing. Does that help to keep the roller in place? We also have the 81-295 and the 81-015N rollers with the screw tab at the top of the housing. See if this could be something you could use in your door. Lastly, if your housing is still in good working order you might be able to just replace the wheels and axles. Look at the 81-266 and 81-272 depending on the wheel diameter.