The original bezel was a dark smoke plastic screen that had a black border around the outside edge of it, You could acomplish the same effect if you masked off the proper amount around the edge and sprayed it with flat black paint.
A lot of times they just flipped the original DK bezel around with original artwork facing into the cabinet.
Some of the more talented people here have created their own custom artwork for the bezel that looks pretty sharp actually.
Good luck on your search.
You should post your before after pics in the Restoration section, after all between what I started and you have done to that cab to bring it back to life is what this place is all about.