I had an RM Stator coil. It lasted about 6 rides. Junk. If you want top quality that won't leave you stranded, spend a little more and buy from sheerider1026.
I used a heli-coil on one of my head studs and it worked great. Just make sure you get the heli-coil far enough down in the threads so the stud is installed at the proper depth. This is especially critical if using acorn nuts.