This particular wire set we make is for the early 40's-on model Tractors that came with Spark Plug boots.  These solid copper core wires that are tinned for corrosion are designed for the above models equipped with either the "J" series Mag (FMJ4B3) or the earlier "K" series Magneto. (FMK4B or FMK) firing off the 116 BE engines or 125 CE engines.     FOR MAGNETO ONLY!