Most Auto Parts stores stock "Heli Coils". I'd investigate those first. If you have a suitable place for them they are better than new. For instance they are used extensivly in aluminum cylinder heads.
You should also use some method of anti corrosion either "Never-Seize" or Thread Locker "Locktite is one brand name, Permatex also sells them both.
You should also use some method of anti corrosion either "Never-Seize" or Thread Locker "Locktite is one brand name, Permatex also sells them both.
