----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----Neil; Why not use the BG4B2S spark plug? Fresno Air Parts lists them for $1.75 each. (They advertise those plugs along with two Bendix SF-4 mags for the A-65-75-80 Cont)
If you do not have shielded harness, you may want to think about buying a set of bushings (1.75 each) and use 14 mm plugs. You could even use automotive plugs if you have the bushings.
Lynn Nelsen
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