Interesting - I'd like to know about this as well, as I've got several cars which I'd like to convert - but I want to keep the look right with a 'dynamo'
Got a feeling I saw it at either Cambridge Motorsport or Revington TR. Deffo one of the TR specialists. I didn't think it was massively expensive for what it is though, seem to remember circa £ 300 which I thought fair. Not as cheap as a 17ACR & bracket from the scrappy though