Unless they're really short, and you plan to run it a lot, they're probably okay. You could clean up the faces the same way you clean up the commutator, and if you want, lightly sand the faces. They'll need a break in period if you do that. I've never had to replace brushes (it takes a lot more running to wear them out than I'll ever do), so I don't have any suggestions where you can get them.
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