i was on the run today and relized i needed an extra glow plug so i bought a OS P7 Medium plug,cause thats all they had for a good plug!..this plug should be fine right?...has any 1 tried these?...i didnt need to run it,but i needed an extra just in case!....i run 20% with a .4 shim stack and usually run odonnel 77t or 97t if they have them!