These plug wires are not designed for a 1991 Nissan 240sx. The connectors where the spark plug attaches to the rubber piece do NOT seal out water or dust because they are too small. The design exposes the plugs and the internal part of the plug area to dust, oil, water, and the elements that enter the engine compartment. So, I need a refund, or the right wires. The current wires in my car are much larger and completely cover the opening where the wires are installed.