This Spark Plug wire set is made specifially for the D10-17 Tractors equipped with either the 149 or 160 4 cylinder engines. Hi quality Spark Plug wire equpped with our Hy Heat Silicone Spark Plug boots. Cut and numbered to each cylinder. Carbon Core Resistor wire which can be used with Pertronix E.I. conversions carries plenty of power to the Spark Plugs! No performance lost with these wires!