The rubber buttpads are readily available though personally I prefer the normal USGI pad. Maybe start by checking Marstar for the pad.
As for bedding - what are you trying to do? Remove bedding from a stock someone bedded to a different rifle? If so, you either have to grind, chisel or scrape it out. There is a good chance you would have to re-bed afterward because your stock bearing surfaces were likely inletted for the bedding compound.