Just for information. The correct Moto-Lita boss for the Later Spitfire, with TR7 column and shroud around indicator and wiper stalks. Is a B59 and not the B45, which seems to be advertised in most places, for Triumph Spitfires from 1977 onwards.
I have read on a few forums of people cutting the shroud to accept the longer B45 boss body. With the B59 its a straight fit with no cutting required.