Rollers for a 1973 era sliding glass door, manufacturer unknown

I'll use the following terminology: vertical frame member, horizontal frame member, 4-sided bracket, 3-sided bracket, roller axle. I'm trying to describe the door in a way that makes my terminology clear.

The door has a vertical frame member that runs the height of the door that seals to the glass.

The door has a horizontal frame member that runs the width of the door and fits inside the vertical frame member and also seals to the glass.

There's a 4-sided bracket that attaches to the lateral side of the vertical frame member by the upper mounting screw. It has a horizontal side that is flush against the upper edge of the horizontal frame member. It has a front and a back vertical side that are flush against the front and back vertical surfaces of the horizontal frame member, respectively. These front and back vertical sides have vertical slots in which the roller axle can travel for height adjustment. The lip on the bottom the horizontal frame member in which the front and back sweeps mount prevent the removal of this bracket from the assembled door.

There's a 3-sided bracket whose front and back vertical sides contact the roller's bearing assembly. The lateral vertical side of this bracket includes the threaded hole through which the height adjustment screw threads. The point of the height adjustment screw is flattened (after assembly) so that the screw can't be fully retracted from the bracket; so I cut off the head of the height adjustment screw in order to remove 3-sided bracket.

Picture 1532 shows 3-sided bracket through which the height adjustment screw threads. It shows the upper mounting screw and the height adjustment screw. Note the head has been cut off the height adjustment screw, and there's a plastic spacer. The picture also shows the vertical roller axle slot in the 4-sided bracket.

Picture 1534 shows the 3-sided bracket from another angle.

Picture 1535 shows the side of the 4-sided bracket through which the height adjustment screw extends.

Is it possible to replace the rollers on this door?

Hello Emily et. al.,

I would have included a picture of the outer housing, but I couldn't see how to remove the outer housing from the bottom horizontal frame member. The sweep grove seems to be part of the fabrication of the bottom horizontal frame member and the presence of these sweep groves block the removal of the outer bracket through the bottom of the horizontal frame member. I don't know, but it seems to me that the manufacturer inserted the wheel assembly consisting of the combined outer and inner bracket parts into the end of the bottom horizontal frame member, then inserted the bottom horizontal frame member into the vertical frame member. So there seems to b e no access to the roller assemblies without destroying the door by removing the vertical frame members.

Is there anyone in your organization or network with enough familiarity of how such doors are constructed that they could inform me whether the roller assemblies in these doors are serviceable/replaceable?

Thank you so much for reading and responding to my original post, and for any additional help you can provide me.