A. Yes, everything (except putty) is included to "hang" these disposers onto your current sink. As far as these disposers fitting up "exactly" to the same dimensions of your old disposer, that is nearly impossible to determine. Just like cars that change models and aren't always the exact same size/dimensions as the previous year, disposers models do vary somewhat from year to year and we can not "guarantee" that the new one will fit "exactly" in the same place as the old unit (even if it is the same model number and from the same manufacturer). Generally just a few parts at most are needed to make the change over.