The main headlight is a H4, with BOTH dip and mainbeam, but the INNER post section is a H3 again.
The HID can be fitted to the fog lights, but it needs the rear of the housing cutting out as it simply is not deep enough to accommodate the extra length/bulk of the HID bulb.
Up to you but a lot of money to spend on something so rarely used, I have fitted some Ring Aurora day running lights in place of my fog lights, so the car can be seen easier in the daytime.
tabetha