This is a True Spark Electronic Ignition Replacement Distributor. Complete ready to drop in distributor with cap and rotor. All brand new parts. Fits Triumph Spitfires from 1962-1974 and Heralds from 1959-1971 originally fitted with Delco Distributors. These work on Negative Ground Cars Only and have no provision for a Tachometer Drive. When fitted the tach can be converted from the later Electronic ones used in Spitfires or other British Cars. Please note that these do not fit the 1975 and later Spitfire Blocks originally fitted with Lucas Distributors.