Need to ID Rollers for 50 yr old Sliding Glass Doors

These doors are about 45-50 years old. We have 4, 4' doors with 2 of these rollers on the bottom end of each door.
We couldn't find any markings on doors or the rollers.

The sliding screens on the outside, I ordered rollers for them, a couple months ago and installed, working great. The old rollers for the screens had Alcan on them, nothing on the screens doors themselves. the screens are the same age as the doors.