The Ducellier dizzy has the condensor monted on the outside of the main dizzy boby and the Lucas type have the condensor on the inside with the rotor arm.
Hope this helps, I had the same problem with mine.
Make sure that you use an ETCH Primer before painting to ensure that the final coat will adhere to the bare metal. I've just finished painting my 88" SIII (brush painted with coach enamel) and it came out better than hoped for.
Good Luck and keep us posted.