WILLIAMS RENAULT 19 CLIO 2.0i 1.8i 1.7i 16V. CLIO WILLIAMS 2.0i 16v F7R 1991 > 98. CLIO 1.8i 16v F7P 1991 >98. They have a waterproof seal around the spark plug and are resistant to oil, water and under-bonnet corrosive materials.Ignition leads connect the distributor to the spark plugs and therefore form an important part of the overall car engine ignition system.