Alternator parts - diode packs, regulators - where from?

[motco]

Ever since LSUK (the old Lucas spares network that sold all these sorts of bits) went bust there hasn't been anywhere obvious to buy parts like regulators and diode/rectifier packs any more. Has anyone any ideas please, anywhere - mail order is fine I just don't want to have to pay for a refurb when I know it's only one of these two components that is needed.