2 pin to 3 pin ignition module conversion lead to suit Rover V8 Distributors.
They allow you to convert the older 2 pin connections and then fit directly onto the latest 3 pin distributor so convert the vehicles harness from 2 pin to 3 pin.
Typical uses are :
Later Mini, Ford etc
Land Rover, Discovery, SD1 Range Rover Classic, V8 Defender Kit cars, TVR Morgan etc