Sierra 18-8813-1 Volvo Penta Wiring Plug Set Kevlar core for maximum durability and long life; Durable stainless steel wound conductor for maximum horsepower and engine performance; Premium silicone jacketing and boots for the ultimate in high temperature protection; Superior RFI suppression for the most sensitive electronic system; Corrosion resistant stainless steel spark plug and distributor terminals for maximum conductivity; Specifications: Cyl: 4; Ignition Type: Conventional; Wire Size: 7mm; Interchangeable with: Mallory; 9-28013; Volvo Penta; 875571;