Here's one for the Classic guys - a 12 volt, Negative earth, 45 Amp Alternator
in a Lucas C39 / 40 Dynamo case.
It is a direct replacement and will fit the original dynamo mounts in many classic cars.
It has a built-in regulator and a 15mm diameter pulley shaft with a 3mm keyway (with key).
Two 3/8" male spade connectors.
Three, 8.5mm mounting holes.
Case diameter 106mm.
Weight 3.5 Kg.