Sierra 18-8832-1 Mercruiser HEI V8 Spark Plug Wire Set For Mercruiser 454 EFI, MAG MPI, 502 EFI, MAG MPI engines with the Delco HEI ignition systems. Sierra aftermarket parts are manufactured to meet or exceed OEM requirements. Wire Lengths 1 Spark Plug Wire 29 3 Spark Plug Wires 33 2 Spark Plug Wires 39 2 Spark Plug Wires 45 1 Coil Wire 9 Interchangeable with Mallory 9-28011 Mercruiser Stern Drive 84-816608Q68 84-816608A68 CDI 631-0006 California Residents WARNING Cancer and Reproductive Harm -