Forget right now the HID bit the generator will struggle enough with the H4 unless you stay over 3,000 revs all the time as you yanks have to have the light on all the time, at least in UK the battery gets charged during the daylight!!! (when we get any).
Also if you havent got the two crome rims with all the hardware including the adonised retainer you cant fit it----unsure as you said you had a "shell" as to whether you have any light at all