Herman, you should get it today. About +4's I'm not sure. For the 4/4 I doubt that there is a difference between 1977 and 1978 as it is virtually the same car with the same engine. If your car was restored it may have a bigger tank (see below)
@Graham: As with everything Morgan tank capacities may vary a little from car to car. Quite a few of my friends with Morgans from the sixties and seventies fitted slightly bigger stainless tanks when the original rusted through or (more often) split. If my memory serves me 45 litres are possible.
Frank
