Been having problems with my fuel rail guard coming off, twice in the last 12 months or so the metal rods have sheared off after the nuts appear to have worked loose/disappeared. When looking at the 2 holes in the guard also they do not seem to be identical, one is circular while the other is more oval, could anyone on here confirm if this is not right, seems to me like the oval hole should be circular also and has became oval due to vibration etc and then putting stress on the rods causing them to shear? Or maybe I'm wrong, can't find a pic of another guard to compare. Pics below, cheers!