I bought a new alternator from ebay rather than refurbish my old one, it not "exactly" the same but it looks great and works.
Tip (if you buy a new one), clean the alloy to remove any oils (mask the plastic), then paint it with "clear VHT paint", couple of light coats and it will look new for years. ( problem is it makes everything else look old in your engine bay) I bought a head lining in melbourne about 7 years ago, I think "classic motor trimmers". It fitted pretty good and looks Ok compared to the original. New Original clutch pressure and clutch plate in mine, shop around and you can save some money.
Mark