Did you loose the whole roller, or just one of the magnets in it?

Have you tried contacting the door manufacturer? Usually they just use neodymium magnets in this case.

The whole roller is gone, I think it fell off and got swept into the trash or something, That's my best guess. And like I think I mentioned, I scoured the door (tops bottom sides etc) for brand name and there is nothing. The whole house was remodeled 5 year ago. We've owned it for 3 so it's fairly recent product. If I knew the manufacturer I'd be so happy! It's is a double door and it looks awful to have one side open and the other not. :-(

Did you look on the top of the door as it is open? Post up some pictures. We might be able to figure it out for you.