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Yes, they can be rebuilt with a kit. You should be able to get the kit most anywhere. I'd try NAPA first. Either that or look in the yellow pages for Brake & Clutch.
The kits are pretty basic. Its a quick and easy rebuild
The problem is that if the seals go, that's probably because the bore is pitted. And you can't hone away deep pits. So, check the bore before wasting money on a rebuild kit.