The back side of the hub, you talking about where the inner spindle bearing goes on? Its metal with a rubber seal and a coiled wire in it. I got that piece. I also replaced the rubber seal and metal plate that goes on the outer axle shaft. It meets up with the backside of the spindle.
I dont like the idea that there is nothing sealing the axle tube. Oh well I guess. Its odd that it looks like there should be something there, especially with the recessed lip that you can see in the first pic.
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