Can someone tell me the correct rear light / stop light bulbs for my A3k please ?.....the old girl is the 6 volt version....the Haynes manual that I have contradicts itself, in the lighting section it states that the rear light is 6v 5 w....and stop light 6v 15w.....the wiring diagram has this the other way round, I think the first option is correct, but just looking for clarification.....Thanks.