The original rear wheel bearings were open to rear end gear lube. That worked out OK until you developed a leak and the gear lube didn't reach the bearings, which was probably the primary reason for bearing failure.

I believe if I was spending the money for the saver bearings and had an option, I would get the kind that were prepacked and sealed on both sides.

That being said, the only option for rear wheel bearings on my 9 1/4 were the open to gear lube style. Gene