Brand New Dynamo to Alternator Conversion but with original looks! 

Positive Earth Lucas C39 & C40 size as fitted to Most Series 1 & 2 Land Rovers

45amp 12v Alternator is built into a Dynamo Case

Mounting points 145mm apart inside or 165mm outside

Internal voltage regulator in the body

The original pulley will need to be used and potentially modified (Hole size maybe different)

Instructions available here