distributer identification help

i would like to change my distributer cap and leads but i dont now wot sort i have lucas or the other one its a 1977 series 3 petrol and its a black top cap
any help would be great

Black is usually Lucas 45D - the wire from the condensor goes to a piece of copper secured by a nylon block which the spring for the moving contact is attached to. The condensor, wire, copper bit and wire to the connector (to the coil) are all in one piece.
Dingocroft Distributor Components
this link should help
If this doesn't make much sense it's 'cos I've got an over affectionate cat sitting on my chest stopping me from seeing the keyboard!

cheers for the help