Sierra 18-8834-1 Mercruiser V8 Spark Plug Wire SetSierra's spark plug wire sets are designed exclusively for marine engines and are the highest quality marine sets available anywhere in the world. Sierra's sets are custom-tailored to each marine engine for a perfect fit. In addition, they have been thoroughly tested to ISO quality standards and will out perform any other marine wire set. For Mercruiser 350 Mag MPI MIE Gen+ with Mercury HEI ignition.; Lead Lengths: (1) Spark Plug Wire 29"; (2) Spark Wires 33"; (3) Spark Wires 39"; (2) Spark Wires 45"; (1) Coil Wire 12"; Interchangeable with: Mercury Marine; 84-816608Q83; Mercruiser Stern Drive; 84-816608A83;