NAPA would be the last place I'd be looking for that non original 8N coil.
I see val blt shows a 12 volt coil for the 8N in their 2006 catalog. Might be YT has such a thing.
A 6 volt coil with a resistor the same resistance as the coil primary will work well on 12 volts.
There's another reason for a resistor and fewer primary turns. Not important for a tractor, but for high speed engines, the inductance slows the current rise and the low inductance coil with the current limiting resistor allows a faster current rise and so higher speed engine operation. Some hot 6 volt Chrysler products used a 3 volt coil and a resistor for that reason.
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