I just finished a DDM HID conversion with the Bosch H4 housings that I got from fuel pumps USA for $50 shipped and they are identical to the Hella e-codes everyone raves about.
http://www.fuelpumpsusa.com/-c-1/bosch- ... ghts-p-210
http://www.fuelpumpsusa.com/-c-1/bosch- ... ghts-p-210