Seat Track Lube?

For some of them, only those bolts that attach them to the seat keeps the cage inside.
I recall one set ( might have been early A ) There was something more preventing one of it roller cage from exiting one end. A dimple in the center prevented both from exiting same end. I turned that one over and defeated that dimple with a punch and hammer. I may have even drilled a hole for access to that dimple. Its been too many years. I know both came out the same end and I had to reset the dimple when I put them back together.