Alternator plugs show up from time to time in eBay, usually with their charging harness.
You might also try this:
Wiring Harnesses - Narragansett Reproductions - Wiring Harnesses and car restoration supplies
and see if they have the correct plug.
Correct pulleys are extremely rare. John at CompClassics had one for sale a few years ago. Contact him and see if he still has it. Other than his, I've never seen one for sale.
Larry