The bearing "balls" are trapped in the sheet metal housing. Removing the upper race would be a chore, and the lower one not much easier. I had a set that turned out to be the wrong size for my application...sold them to "super55", perhaps he can shed some light on this? I would be inclined to say that with the limited number of miles these old relicts will drive, that replacing the bearings and not the races would be okay...provided that the races are in serviceable condition.
