Call Ian @ RS Turbo Breakers in Poole 01202 547070. He has new P100 lights for sale. Tell him 3dr P100 Chris put you in touch and he might give you some discount. Clean the bulb holders up and bend back the metal lugs and they will work as good as new.

Get on ebay and buy the plastic covers that go over the back to keep the water out. Ive got a pic if that helps as i found some genuine old stock on ebay. Otherwise they will just corrode.