Not sure about now but back when I delivered commercial parts for Advance Auto they had a "bin" with freeze plugs of different sizes and some different shapes. Give them a try......if no luck, look for the oldest longest running parts store in your area. You may have to try one somewhere around Laurens, Easely or even Spartanburg.....like the old Spartan Automotive place which is now a carquest but they use to do machine work/rebuilds.
