Seconded the RCBearings website. Got sets for both my Senton and Big Rock there. Just make sure you pick the rubber shielded option, not the metal. The set even came with the small 2.5 x 5 x 8 bearings from inside the diff case but I wouldn't bother replacing them, no need to be rubber shielded inside there and if you take it apart, the diff oil will just leak out.
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