Set of "Lucas Copy" ignition coils for Triumph 500, 650 and 750 motorcycles from 1966-1983. They can be used on earlier unit models if you are converting to 12 volt as well. We use these coils on our builds, they are virtually bulletproof.We highlyrecommend that you use copper core wires with your new coils, especially if you are running modern electronic ignition systems. We alsorecommend using the proper spark plugs for your motorcycle. We offer free technical advice so please feel free tocontact us with any questions you may have.