"Sliding Points" electronic ignition conversion. The two best features of the new Pertronix Ignitor electronic ignition conversion kit are the low price and the fact that it fits entirely inside your stock distributor cap! (Negative ground only!) All previous ignition kits utilized an external black box, not the sort of thing you want under the hood of your stock-looking engine compartment! And, like the more expensive electronic ignition kits, once you install the magnetic trigger and sensor, you will never have to change points again! "Fixed point" version is LU143. Also, available for early, 23/25D Negative Ground (LU142) or early 23/25D Positive Ground (LU142-POS) distributors.