I need to replace a headlamp on my 1973 e-type 2+2. The wiring has me baffled. In the center back of the headlamp are two prongs with wires attached. On the back near the outside rim of the headlight are two other prongs with the wires attached that seem to be set inside the headlight structure. According to my manual, the headlamp should have a more standard three-prong setup. Anyone know where I might get a replacement headlamp? Is there an adaptor that will allow me to go from the current wiring to a standard Lucas headlamp?