We need to replace the plumbing for this old American Standard sink. We have new stems and seats and the old handles are reusable, but we need a new brass mixing chamber (the hidden part that connects from the water supply to the handles and spout) a drain flange and tail piece. Our local plumbing store tried, but was unable to locate the parts we need. Can anyone tell us where we can find these parts within the tri-city triangle of Providence, Boston and Hartford? Or ******? We'd really like to keep the sink as it matches the toilet and tub in our old bathroom. Thanks!