Amazon Secure Payment System Continue shopping “Sierra International 18-8811-1 Premium MagForce Marine Stern Drive Spark Plug Wire Set for Mercury Marine and OMC Engines” has been added to your cart. Product Price Quantity Subtotal × Airhead MACH 1 Towable Tube $113.05 Airhead MACH 1 Towable Tube quantity $113.05 × Sierra International 18-8811-1 Premium MagForce Marine Stern Drive Spark Plug Wire Set for Mercury Marine and OMC Engines $45.56 Sierra International 18-8811-1 Premium MagForce Marine Stern Drive Spark Plug Wire Set for Mercury Marine and OMC Engines quantity $45.56 Coupon: Apply coupon Update cart Cart totals Subtotal $158.61 Total $158.61 Proceed to checkout