Notes: w/ Marelli Distributor Original cap is "Genuine Marelli". Unfortunately Marelli of Italy is no longer producing it. The Jaguar Dealer, as well as the aftermarket can only offer a less substantial version of the original. As per info from a independent Jag repair tech, you can avoid distributor cap failure by doing the following: Gap the spark plugs at .025 instead of .035 - And Always Replace the Ingition Wires, Cap, and Rotor