Roller assembly for a sliding door most likely from the 70's.

Thanks for contacting SWISCO. I'm afraid removing the entire roller assembly is the only reliable way of identifying a possible replacement. On older aluminum doors, the bottom part of the door can be removed in order to access the rollers. If you can provide us pictures of the entire assembly, as well as the height and thickness of the housing and the diameter of the wheel, this would be most helpful in identifying what you need. Thanks.