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I'm not sure you can find many replacement parts for hubs, but I'm no expert in that field, yet.
If you completely replace the hubs, I would recomend Warn manuel hubs, I havent had one break on me yet. As far as I know, there the best made.
Good luck bro
Warns cost ~$80pr, and that's everything - not just the caps with the ****. They're warranted forever, but so are $60 MileMarkers and mine have taken all the abuse I've put them through. I bought mine at O'Reilly Auto Parts.