Replacing broken sliding glass door rollers

Hi! I have no idea what brand name the door is. I've looked and haven't been able to find anything on it. It may be as old as the house, which was build around 1980-1983 range. It's a metal frame (heavy) sliding glass door. The rollers are old and worn out, and the one closest to the locking side of the door sticks/will not roll. I have to lift the door to get it to close. I'm hoping you'll be able to find something similar to the roller I pried out to take a picture of. This is the broken roller. I was able to unstick it for a few days of wonderfully smooth use before it jammed up again. Help me find a replacement roller???