Sierra 18-8835-1 Spark Plug Wire SetSierra replacement spark wire set for Mercruiser Stern Drives. Sierra's spark plug wire sets are designed exclusively for marine engines and are the highest quality marine sets available anywhere in the world. This set has been thoroughly tested to ISO quality standards and will out perform any other marine wire set. Ignition Type: Delco HEI; Lead Lengths: (2) Spark Plug Wires 29"; (2) Spark Plug Wires 33"; (2) Spark Plug Wires 39"; (1) Coil Wire 15.5"; Interchangeable with: Mallory; 9-28023; Mercruiser Stern Drive; 84-816608A82; 84-816608Q82;