Re: '04 Navigator OEM HID woes
If I were you, I would buy an aftermarket kit. This should come with 2 new bulbs, both ballasts, and all of the necessary wiring. The kit should be plug and play, so installation should be a breeze and you can just use your factory locations for mounting the new ballasts. Otherwise, it looks like ebay is your only other choice.
-1992 Ford F-150 (winter truck)
-1998 Lincoln Mark VIII LSC (fun car)