Prewar Car the site for old cars and parts.

Vintage Knowledge, hints and tips section is worth a look.

Restoration Supply Company good general car hardware (US)

Paul Beck Vintage Supplies parts for proper cars

Bronze and brass fasteners

Classic fasteners good Aussie site will send small quantities.

Classic Dynamo & Regulator Conversions also LED lamps

Vintagent a great vintage motorcycle site.

Barnstormers a rather eccentric Kiwi motorcycle site.

Car and Classic UK great car classifieds.

Narrywoolan a site about all sorts of things including the Lancia Aprilia.

Australian Lancia Register The Australian Lancia Club

Bugatti Club Australia

Vintage Sports Car Club (Vic)