18-8800-1 Spark Plug Wire SetGM 4cyl 181 (3.0L) 120 (153cid) 2.5L Conventional Mag Force Premium Marine Wire Leads Magnetic Suppression Kevlar Core Durable stainless steel wound conductor for maximun life, horsepower and engine performance Superior RFI suppression for the most sensitive electronic systems Corrosion resistant stainless steel spark plug and distributor terminals for maximum conductivity replaces: OMC 503748 replaces: Mercury Marine 84-813720A5